launch event The Wiltern music concert venuelaunch event The Wiltern music concert venueKim Kardashian, Pete Wentz and Blink 182's Mark Hoppus were among the lucky celebs who were on hand to see Eminem and Jay-Z share the stage at the Wiltern Theater in Los Angeles.

The rare joint appearance was at the launch party for the new DJ Hero video game.

A spy inside says the crowd went wild as the two rap legends performed hits including "Renegade."

What an awesome night!!!