tonight on "nightline," celebrity weight loss. we go inside "us weekly" magazine's biggest selling issue to find out the surprising motivations behind the stars weight loss campaigns. what works, what doesn't, and what diet might work for you. plus, the spansexual. she's a she and he's a he, too. we meet the only person in the world who has been officially declared not to be neither a man nor a woman. and, dance fever. it's on view, on the football field, the basketball court, the concert stage. and, of course, the internet. why the dance craze, the dougie, became a "sign of the times." >> announcer: from the global

resources of abc news, with terry moran, cynthia mcfadden and bill weir in new york city, this is "nightline," january 4th, 2011. >> good evening. we begin tonight with the subject of many a new year's resolution, weight loss. dieting is big business, in fact, a $60 billion a year business here in the u.s. part of the reason why 50 million of us go on diets every year, only about 5% manage to keep the weight off. so, why do so many celebrities seem to succeed? each year, "us weekly" devotes a special issue to celebrity weight loss. a star-studded who and how of thinning down. this year, we went behind the scenes as it all came together. here's chris connelly. >> reporter: it's not only star-crossed romance that holds the attention of celebrity-minded magazines. on a parallel track, the ups and

downs of celebrity bodies and diets keep readers enthralled, too. in the celebrity weight loss world, there are the big success stories, like valerie bertinelli. the sitcom sweetheart who used jenny craig to lose 40 pounds and rocked this bikini. >> i've been given an opportunity to, i guess, be the poster child for getting your [ bleep ] together. maybe? >> reporter: but putting on a few, or maybe more than a few, gets everyone talking. it even gets celebrities talking back. celebrity diet and fitness sagas pull their weight at the news stand. that's why editors at "us weekly" offer a 23-page package in their january 10th issue. why is the first of the year a good time to do an issue like that? >> new year's resolutions. this is the time of the year when everyone's resolution is to hit the gym, to get in shape, to eat better. so, it's a natural.

>> reporter: why do people like reading about this stuff? >> it gives them motivation. the best motivation is to look at others. it's not envy, it's jealousy. there's a difference. ♪ >> reporter: talk about different. check out the flawless form of "dancing with the stars" siren audrina patridge. tone, trim, to die for. this spread suggests you can look like her with tanner and butt cream. good luck with that. >> firming cream. >> reporter: does someone apply that for you? >> whatever you prefer. >> reporter: that's a good way to go. sure, the slim and famous skip desserts and work up a sweat. >> j.lo looks amazing. >> reporter: but celebrities have a leg up on the average american. thanks to an armada of pros on their fitness team. halle berry has a five days a week workout professional. there's this issue's cover subject, jennifer lopez.

>> she's relatable, because she's not stick skinny. she had twins and she sort of miraculously transformed her body from being a very, very pregnant with twins in 2008 to now looking better than she ever had. >> reporter: diet and exercise? you bet she did. but j.lo counts her top of the line personal trainer. and suggests a balanced cleanse to anyone eager to be 50 pounds lighter, but no less booty-licious. why are these guys the right ones to figure into this issue? >> the readers love jennifer lopez but she's had success losing weight after a baby. look at her abs. she looks amazing. that's inspirational. >> i was looking at those abs. >> i could tell. >> reporter: naval-gazing was all the rage in 2006, when this janet jackson weight loss cover was a big seller. driven by reader interest in the

person she had become and once been. >> she revealed she lost 60 pounds in a bathing suit on "us weekly." it was huge. one of those moments where everybody stopped and said -- oh, my god, look at her, she's back. >> reporter: and that was a gorgeous photograph, too. >> yeah. and that's what makes her so relatable. she is a yo yo dieter, her entire life. and it is a struggle for her. that makes her so human. >> reporter: the all too human personalities revealed on reality shows can offer their own weight loss intrigue. on "the bachelorette" ali fed tow ski found love with roberto martinez. >> will you marry me? >> oh, my gosh. yes. >> reporter: and a few bad eating habits, too. >> when we moved in together, i ate a lot more like him and i realized, i can't eat pizzas at 2:00 in the morning. >> reporter: at her "us weekly" photo shoot, she now show cases a newly sleek shape. >> and lean into me a little bit.

>> reporter: this is one of our favorite places to hike and it's a good workout. we've been -- we're not able to run the whole thing, but we walk some and run some. it's good. >> reporter: and takes that healthier figure -- to the beach in san diego with her fiance'. >> what i change is what i eat, honestly. i eat a lot of small meals throughout the day. >> she just gained the boyfriend weight. she moved in with her fiance' and she gained ten pounds by eating with him. >> we're not talking jabba the hut here. >> absolutely not but that's relatable to women who have five or ten pounds to lose and they can't seem to get it off. >> how about something like jennifer hudson. >> absolutely. she's lost six dress sizes. >> once known as the "american idol" runner-up, who soared in "dream girl" -- with the help of

weight watchers, jennifer hudson has lost 80 pounds! and gained a new silhouette. along with the attitude so many want to emulate. >> i've tried diet of diet, plan after plan and have only gotten so far, but never this far. i feel like i have a new life. i feel like a brand new person. i feel like i've conquered the world. >> reporter: their slimmed-down sizzle may be something to aspire to, but celebrity bods are their business. big business. how can a civilian ever hope to measure up on the diet and fitness trend? >> a lot of people can't afford the diet plan, so, they look to these magazines and they can do it on their own. they can sort of put their own plan together for what works for them. >> there's always air brushing. well, here's wishing you the best of luck with your new year's resolutions, whatever they may be, and hoping you'll watch our special, "celebrity weight loss, what really happens," tomorrow night at 10:00 p.m. eastern.

when we come back, we'll meet the first person in the world ever to be issued with identity papers that state sex, not specified. [ male announcer ] learn about a free trial offer from abilify.

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well, two doctors examined the person you're about to meet and couldn't say the person was one sex or the other. physically or psychologically. the person was born in scotland but lives in australia, which is where nick watt found himself on his way to meet nori, to talk about the life in the gray area between he and she. >> reporter: a typical australian beach scene. there's some posing and flirting going on, some stair oyoowe st o

stereotypical behavior. but a little wakes inland, in a gritty sydney neighborhood, we meet nori, who challenges all of that. a flowing dress, a flat chest, largish bear feet. a hair cut that could be male or female, it's short back in sides and long on top. nori is neither a manor nor a woman. you don't see yourself as male or female? >> i see myself as male and female. >> reporter: and nori, who goes by just one name, who is happy to be called she or he, is the first person in the world ever to be issued with identity papers that state sex, not specified. i say to you, nori, what gender are you, and what is your answer? >> what are the options? >> i'm not specifically m or f. you can't specify me as being

male or female without committing a fudge, at the very least. >> reporter: xo doctors examined nori and couldn't say she was one sex or the other. hence, sex not specified. >> there are men, women, most of us fall into one of those categories. but then there is a minority who falls in between. >> reporter: and that's where nori falls. in between. she's that wait in life, too, part shy and bookish, part wildly confident and outgoing. we went her on a night out to watch a friend's band play. and on sunday morning, we went with her to church. >> amen. >> reporter: nori was born a totally normal boy. in small town skocot land, 49 years ago. the family soon emigrated to australia, for a better life, are nori grew from a slightly

awkward teen into a glamorous gay man. >> at that stage i was very an drug nous. this is the 1980s when boy george was allowed to do that, but don't you do it in real life. >> reporter: discriminated against at work by day in a government office, at night, nori socialized with transvestites and transsexuals and became a drag queen. >> reporter: how did your parents deal with it? >> i think my dad just put it in a hatbox. my mother seemed to be fairly accepting. she decided if i was going to be female, i should stop being a trampy slut. >> reporter: gradually, nori came to believe she was a woman in a man's body. >> i knew i couldn't do the role of man, so, the role of woman seemed to be the one i was getting approval for. >> reporter: nori had sex change

surgery. w here she is in her first days as a woman. >> for a couple of years after that, i was happy about it. >> reporter: and felt female? totally? >> i thought so, yes. until i then got involved with straight guys who, when they found out i was a tranny, told me i wasn't a female. they felt they had been lied to. i was threatened with violence. >> reporter: native american tribes had a third gender. a third gender survives to this day in thailand, where lady boys, an accepted strata of society. and, in south asia, most of whom are born outwardly made but choose to live like women. they remain an important part of hindu culture. >> i think in the last century in our western thinking, we very much went to thinking about people as either men or women. >> reporter: and, two years after surgery, nori felt like

neither. stopped taking the hormones that had softened her skin, produced breast tissue and broadened her hips. she stopped taking the hormones that made her look female. >> i had to open a cup board every day and take these pills because i'm a woman and they make me a woman. what? why can't i just be me? a long journey getting there, but once i realized i had a right to assert that, things are pretty good. >> reporter: so, what does nori call herself? it's me who seems hung up on giving her some sort of label. well, the best word nori has come up with is this -- spansexual. and why not? i'm nick watt for "nightline" in sydney, australia. >> life in the in between. up next, dance, dance

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>> announcer: "nightline" continues from new york city with cynthia mcfadden. >> well, it began with a hand squirrel made famous in the early 1980s by dougie fresh. there is no denying it was a cool move, with that doesn't really explain the rise of an entire dance sensation more than two decades later. for linsey davis, tonight, the dougie is a "sign of the times." ♪ >> reporter: it's more than a dance. it's a movement that starts in the hips and wiggles its way to the shoulders. it's called the dougie. even if you don't know it by name, you probably have seen it. on the gridiron, jets wide receiver braylon edwards was penalized for taunting after he celebrated a touchdown with the dougie. >> illegal use of the dougie. >> reporter: and on the hard

wood, nba point guard john wall introduced himsz with it. his moves in his pregame introduction have garnered him more attention lately than his moves on the court. the signature move and of course the dance's name sake is the hand swirl made famous by dougie fresh. ellen is down with the dougie, and, so is cnn's wolf blitzer. what did you think when you saw wolf blitzer doing it on the soul train music awards? >> i thought it was pretty funny. but it was -- he started off like -- once he got it, like, yeah, all right, now you got it. >> reporter: the phenomenon started in texas, but this group from california is teaching it to the country. >> everybody was telling us to teach them. we're like, why not? let's do it. >> reporter: the song they made about it, simply called "teach me how to dougie," recently went

platinum. remember when everybody was doing the moon walk? or the running man? and who could forget the 1995 on session with the macarena? ♪ the dougie, which you might consider a bit more hip, has been met with similar enthusiasm by people of all ages and races. >> this hand, then go that way, and this hand go that way. >> reporter: did you ever expect it to become the success that it has? >> not really. that's what we wanted, but we didn't expect it to go this far. >> reporter: more than 2 million people have turned to youtube to learn it, while others have proesed video as proof of their mastering of it. this is the basic step, and then, it's all about adding your own style. >> you know, we brought what we could call flavor.

>> reporter: decades laters dougie still has flavor. bottles of it. when was the first time you did it, the hand swirl? >> i think there was a party in harlem. i just started doing it. they started screaming and everybody started to react and, like, you know, real excited. i said, yo, i think i got something. >> reporter: he was right. are you getting it into right now? >> i'm just kind of like -- i'm already in it. i'm always in it. >> reporter: so you taught wolf. see what you can do with me. >> okay, you ready for this? i'm going to roll up my sleeves for you. i can see, you know, you got a little swaggy swag. you see, the dougie, you got to put your unique twist into it, okay? >> reporter: there's part with your head, too, right? >> they putting a double time in there. and then they go -- >> reporter: right, right.

>> right. >> reporter: i look really stiff, right? i look like wolf doing it. ♪ >> reporter: that's his trademark. simply smoothing his hair back. a little move, a monumental dance. >> bring it back a little bit. >> reporter: i'm linsey davis for "nightline" in new york. >> i think you've got it. sure looks like fun and i will be practicing in private. when we come back, freshmen congressmen throw a party, but first, here's jimmy kimmel with what's coming up next. jimmy? >> jimmy: tonight, matt leblanc is here, julie benz is with us, and we will witness a man lathering himself with shaving cream. why not? "jimmy kimmel live" is next. health matters to all of us. that's why lysol has started a mission for health. with new mom programs, lysol healthy habits initiatives in schools

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