this is "nightline." >> tonight, why this video of hulk hogan rided a wrecking ball, doing his measures as played in a court of law today. the sensational case of the wrestler versus gawker. will he win his wsuit against the website for posting his sex tape? plus welcome to mariah's world. why the diva hase's invite ing cameras on her upcoming tour. what makes her show different from celebrity reality shows of years past. and stiletto

kerri russell and amanda sayfried hand to heel combat. new self-defense. first the "nightline 5." get your penny's worth. with new suits and kids' dress-up. up to half off colorful spring get $10 off a $25 purchase with coupon. that's getting your penny's worth. what's your dog food's first ingredient?t? in purina one true grain free, real chicken is number one. no corn, wheat or soy. dog's whole body health with purina one. >> number one in just 60

evening. just when you thought the courtroom spectacle that is the hulk hogan trial couldn't get

the former pro the website gawker for posting a sex tape of him. today in open court the consequence fired back by playing a clip of hoganrecking ball in a thong. here's abc's linzie janis. >> you eventually had sexual relations with mr. bollea? >>r: it's the case with huge implications for celebrity privacy. >> do you recall the number of you had with him? >> to the best of my knowledge, i can think a few times thamber. >> reporter: private moments splashed all over the web, then all over the media. >> there's a tape of you [ bleep ]ing heather -- >> first off, i never made a ou swear you were not in on this? >> i swear to god i wasn't. >> reporter: as ever more revealing and personal details spill out of the hulk hogan trial, now in- >> were any of your sexual

recorded during the times you were married to bubba? >> growing sense of just what that lost privacy can really mean. >> it's completely humiliated. >> lly quite sickening. >> reporter: terry bollea is suing the gossip site for posting a portion of the 2007m having sex with heather clem, then wife of his former best friend bubba the love sponge wants to have sex with you." it started out like that. >> reporter: hogan seeking $100 million for the alleged invasion of privacy saying he didn'tng filmed. >> made a conscious decision to expose terry bollea naked and engaged in sex and having private conversations in a privateeporter: gawker arguing that publishing a portion of that sex tape is protected by the first amendment. and as journalists they can

this case is really about a news organization's ability to join a national conversation on a topic that's in the news.cular case, hulk hogan spent years talking in graphic detail about his sex life. today arguing that hogan seems willing to shed his clothes and his dignity when it suits him, showing the jury this ad for his webbusiness hostamania. a parody of mylie cyrus' "wrecking pal." did you find doing that ad empairsing? >> it was kind of embarrassing. but i had only three room with me when i sat on the wrecking ball with the tea bag on. >> did it work? >> yes. >> how do you know it worked?r 3 million views. >> reporter: hogan's attorneys pointing out gawker founder nick

believe in privacy. but also transparency in his own life. >> you got married two years ago? >> i di guests thought they'd be able to tweet and post at his wedding they found out otherwise. >> you had a policy, this was told to all guests before your wedding, phones? >> we asked them, yes. we didn't sue people who broke the rules. >> reporter: the begin ordeal started when hogan was in the midst of shooting a reality show "hogan knows best." he says he and his thenwife linda drift ad part but he had a friendhis back. >> he was holding my father as my father passed away. so there was never any question of who he was or what he meant to his name? bubba clem, the shock jock in florida who suggests an unusual method to make him forget his troubles.

>> do you recall what your answer was? >> i said i would. >> reporter: hogan said he initially knew they had an open marriage because he talked about it on the radio. i thought with me it was so many times they talked about it, it turned into ater: but at his lowest point he says he called his friend clem. >> i said, she's filing for divorce. i called bubba, crying on thedown. bubba said, come over to the house, let's talk. i was so desperate i went over there. one i let my guard down. i felt, these people cared about me. >> reporter: moments after hogan arrived he says clem's wife grabbed his hand and led himthe bedroom. >> from the feeling i had, baba, you're not filming this, are you? he lashed into me. what the hell is wrong with you? i'm your f'ing best re you say that to me. >> reporter: five years later, a tape of that night is posted by gawker.

on this either until later that day. a bombshell. >> when they confirmed that bubba was on the tape and, turned the camera off, and bubba told heather that, this is for our retirement, heather, i started violently orter: in a video deposition heather maintains neither she nor hogan had any idea the encounter was being recorded. >> to the best of your knowledge, mr. bollea had noas a camera in the room at the time of your sexual ebb encounter, is that correct? >> yes. >> reporter: heith clem who apologized for stating hogan knew he was being taped. hogan has refused to settle this one with gawker. >> today was avery good. >> reporter: and for nine days the battle has raged in court with both sides scoring points. sometimes at their own expense.editor in chief a.j. delario seemed to contradict parts of gawker's defense, that the tape was news

publish covered by the first amendment. >> the fact that mr. bollea was taped having sex with his best friend's wife wasn't the news piece, was it? >> no, not necessarily. >> you put it in the public because you believed it was true and it was interesting, right? >> yes. >> and it didn't really matter t was a more bid and sensational prying and people's lives were at stake, that didn't matter to you, did it? >> no. asking denton to respond to this final question from the jury. >> if the video was gratuitous would you still believe that it's covered under the first>> no, i wouldn't. >> nick saying that anything gratuitous isn't covered the by the fir everyone understands our position. actually sounded like they were on our team. >> reporter: hogan getting caught in some alleged >> heather wants to have sex with you, or heather wants to see the size of your [ bleep ]. it started out like that. then

my hand. i walked with her. >> reporter: does heather's deposition contradict that? >> did you ever say to mr. to get with you, i want to do this and that and other stuff, i want to have sex with you? >> not that i recall. >> will the alleged ugh to make a jury doubt him? >> if these jurors don't like and trust hulk hogan, that could have a big impact ol damages here. >> reporter: but if he wins, it will likely set a precedent. >> if hulk hogan wins it will certainly have a chilling effect on to publish even a small snippet of a sex tape. >> reporter: hogan's team hoping to rein in a new media frontier. >> the internet is this wild west territory as it concerns media. there don't appear to be the same rules to some people. and they have to understand, they are bound by the same bound by the same rules and they're pound by the same laws. >> reporter: closing arguments

morning. for "nightline," i'mn st. petersburg, florida. next, she's got more number one hits than any other solo artist. so why does a reality show? anybody remember what happened with paula abdul's "hey paula" show? later, how ace can become a lethal weapon. this is a body of proof. proof of less joint pain. and clearer skin.of proof that i can fight psoriatic arthritis ...with humira. humira works by targeting and helping to block a specific source of inflammationutes to both joint and skin symptoms. it's proven to help relieve pain, stop further joint damage and clear skin in many adults. humira is the #1 biologic for psoriatic arthritis. humira can lower your ability to fight infections, including tuberculosis. serious, sometcers, including lymphoma, have happened, as have blood, liver and nervous system problems,

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ou're as faum miscellaneous as mariah carey, why on earth do you need a reality show? that's what many people in the entertainment world are

letting cameras into her world. here's my "nightline" coanchor juju chang. >> reporter: mariah carey has from the cameras. you can have me when you want me it all hoff in "honey" -- >> reporter: or taking a bath on mtv e's happy front and center. she's a superstar, after all. and now she's taking her exhibitionism to a whole new level in her own show "mariah's world." it follows the star on her sweet, sweet fantasy tour. and as she plans her wedding to onaire james packer. mariah telling the "new york times," "i thought it would be a good opportunity to show my personality and who i am. a lot of people have ions. >> what it is, it's a great

it can make you relevant, it can put you in the media, it can support your music and other basically it's brand building. >> reporter: reality shows used to be a way for regular folks to become famous. think snooki on "jersey shore."kel. a real housewife turned business mogul. touch my body >> reporter: forbeen in the spotlight since she was 20, a solo artist with the most number one hits of all-time like "touch my body." touch my body >> reporter: less owns christmas. all i want for christmas >> reporter: could endlessly chasing fame beshow, do more harm than good? while the reality genre has been good to stars like jessica simpson -- >> is this chicken or fish? michaels of poison -- >> do you want to stay in this house and rock my world? >> yes. >> reporter: no one can forget

>> that's what i need. >> reporter: who was caught on bravo cameras on "being bobby brown" in confrontations with >> what's wrong with you? >> what's wrong with me? >> come on, bobby, shut up! >> reporter: in strange situations. need -- >> reporter: the show badly tarnished the singer's squeaky clean image and had the public re was paula abdul's "hey, paula." the star's odd behavior on her reality show at the height ofopularity -- >> hi. >> reporter: led some viewers to question whether she had a substance abuse problem. she addressed on "nightline" in 2009. >> i've never been addicted to any prescription drugs, i've never been drunk, i have worked.

and not having the ability to haveships, not being able to be a mom, a real mom. i am fortunate and feel completely blessed.ot the girl that's in those tapes. >> reporter: the backlash making her question the decision to ever do a reality show. >> i am onestly think it was the biggest mistake. >> reporter: but "mariah's world" is not designed to be a warts and all production. >>e producers and she said she has veto powers over what is and isn't included. only a star as big as mariah cano power. >> reporter: she's already made it clear that some things are off limits. like her 4-year-old twins with ex-husband nickwhen my colleague michael strahan visited mariah backstage at her las vegas show last year, she talked about the important of shielding them from the glare of

have to be treated as such. it's not just like, they're babies, they don't know what's going on. yes, they're sensitive and they're going to feel any kind of tension.e my living room. >> reporter: but she has let cameras into her private life before. besides "cribs" -- >> this is my. >> reporter: she also allowed e! to follow her for their "uncut"'t make the show so early. >> i don't know that people want to see this much of mariah, but they're going to. >> i don't feel kate r: heather mcdonald was chelsea handler's sidekick on "chelsea lately." and fancies herself something of a reality show expert. >> i'm o shows. if there was a graduate program at usc that i could get a master's degree in reality show, like write a paper onabsolutely could. >> hi, sexy! >> don't i seem professional?

jenner she's had a cameo on the reality shows "keep is ing up with the kardashians." >> i think she's going to regret not buyingnd of the episode it'ses are like, well, you know. kris jenner will be like, you know. in the end i knew that even though my girls fight, going to be sisters. you know, there's always a little bit of a button to like their fighting. >> like "full house" kind of. >> a little, nd "full house" have a lot in common. >> reporter: she has high hopes for mariah's show. >> she can be her fabulous self. we can see her trotting along counting her diamonds. happy birthday >> reporter:e candid moments, the unguarded star. at work -- will you're trying to play like you're so grown >> reporter: and at play.ot willing to lit her hair down and show people what she's really like and give them a peek inside her life, it's not

if it's not dramatic, it's not good tv. if you make it too much pablum and not enough drama, it's not going to achievech is getting viewers. >> reporter: and getting viewers means staying relevant. we'll see if she can do both when "mariah's world" this year. for "nightline" i'm juju chang in new york. why the woman who's like kerri russell and amanda sayfried says the secret to self-defense may be as close as your heels. its sleek design... is mold-breaking. its intelligent drive systems... paradigm-shifting.illed cabin...jaw-dropping. its performance...breathtaking. its self-parking...and

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finally, the fewest trend in self-defense and it involves stiletto heels. does she kick serious butt, she does it sporting sky-high stilettos. the self-defense guru has trained celebrities such as kerri amanda seyfried. >> i've been taking self-defense with abby for four months. and it's pretty much changed my life.up classes focus on teaching all types of women how to protect themselves. using all types of footwear. a former ballerina, she switched focuse while she was just a teenager. >> unfortunately i was satisfaction basically assaulted when i was 19 by someone that i knew. and i tried to find a way to heal myself. my father recommended a self-defense system and it was

feel the sense of empowerment. incident. >> high heels are a key ingredient, she says. so her students are never unprepared. >> the thing is that it's that it's not martial arts. you're caught off guard, so for a woman to live her life wearing high heels, it's a validan should not have to compromise her femininity and be able to defend herself regardless of what shoes she's >> reporter: shoes can become an impromptu weapon. or boost a kick. >> i telephone feel feel more prepared. >> the fact that you living your life will always potentially put you in a vulnerable situation, every single woman can learn self-defense. responsibility and that initiative into her own hands to survive a situation if she was caught off guard is just so important.ou for watching abc

"world news now" is coming up soon with overnight breaking news. tune into gma first thing in theys, we're online 24/7 at abcnews.com and on our facebook page. thanks again for watching and

> coming to you from hollywood, it's "comics unleashed." with your host, byron allen. altman.evy. and now, a man who has as a backup dancer for billy joel, byron allen. >> yeah. yeah.