LOS ANGELES — The stars stepped out Tuesday night for the Los Angeles premiere of Michael Jackson's This Is It at Nokia Theatre L.A. Live.

Among the celebs in attendance at the star-studded affair were Jennifer Lopez,  Adam Lambert, Ashley Tisdale, Berry Gordy, Bill Bellamy, Christian Audigier, David Cook, Jennifer Love Hewitt and Jamie Kennedy, Katy Perry, Lou Ferrigno, Mario Lopez, Martin Lawrence, Mickey Rooney, Neil Patrick Harris, Paris Hilton, Paula Abdul, Eric Winter and Roselyn Sanchez, and Vivica A. Fox.

The concert film, opening in 99 countries Tuesday and Wednesday, offers fans a rare, behind-the-scenes look at Jackson as he rehearsed for his sold-out concerts that would have taken place over the summer at London's O2 Arena. The film is drawn from more than one hundred hours of behind-the-scenes footage, featuring Jackson between April and May as he rehearsed for his comeback shows. Audiences will be given an inside look at the King of Pop as he creates and perfects his final show.

Check out red carpet photos of your favorite celebs at the This Is It premiere.