Who? Rock stars.
Real? Yes, the tape exists, Kid Rock and Scott Stapp are on it.
Basic info from Wikipedia: Robert Ritchie (AKA Kid Rock) and Scott Stapp (former singer of the band Creed) appear in a sex tape from 1999 where the two engage in sex acts with four groupies. California pornography company Red Light District planned to release the tape in 2006, but one of the women involved filed to block it. Ritchie also filed an injunction, called Stapp an “idiot”, and blamed him for the tape’s leak.
Red Light District did post a fifty-second teaser trailer online:
The full tape reportedly runs 45 minutes. Scott Stapp told TMZ, “This was one particular incident when me and Kid Rock had some strippers . . . there is no sexual intercourse on that tape, you won’t find it so don’t get your hopes up.” Don’t worry, no one was getting their hopes up.