why hugh grant thought no one would notice that he picked up a hooker here while he was dating elizabeth hurleyou see a celebrity, i want you to shout, there's a celebrity out there. >> reporter: the unmarked gyms where they work put. >> it looks like a regular house. >> reporter: they point out the swanky apartment buildings where the stars live. >> evander holyfield lives here. >> reporter: but linsey lohan recently moved out. >> you don't have that. >> reporter: and there are the five-star hotels where they make their sex tapes. >> you got any sex tapes? >> reporter: the four seasons beverly hills where they filmed "one night in paris." >> who knew that would be part of the sex tape at four seasons? >> reporter: some of the bus' trial runs, stars have waved eager to be noticed. >> we have tyra banks, fabio. have you ever wanted to be a tour guide? >> i've wanted to do this more than a year. truth be told, i love being a tour guide. it is a blast. did i ever think of being a tour guide, no. could i be a tour guide? i really could. >> reporter: there's no one better informed. what's your favor