There are several artist named RockStar or Rockstar:
1. Rockstar is a cover band featuring Tim Ripper Owens (Judas Priest, Iced Earth, ...), Keri Kelli (Alice Cooper, Slash's Snakepit), James Kottak (Scorpions), Rudy Sarzo (Whitesnake, Ozzy Osbourne, Dio, ...) and Teddy "Zig Zag" Andreadis (Guns N' Roses).
2. A Hard Rock/Sleaze band from Italy.
3. A group from the Philippines.
4. Jony Rockstar
5. An alias for Martin Sponnich.
6. An alias for Michael Dowell.