During a very exclusive party at 50's Vitaminwater house in Park City, Jim was given a surprise performance of In Da Club. "I've got some famous friends," 50 told the crowd before he started singing, "We're gonna party like it's your birthday..."
Jim, who was at the party with girlfriend Jenny McCarthy, then joined 50 as he sang to the crowd. He lip-synced to the song and showed off his goofy hip-hop dancing skills.
Hollyscoop was at the Vitaminwater house when the crowd went absolutely wild during their special collaboration. Partygoers were already fired up thanks to 50's previous performance with Robin Thicke.
And 50 wasn't kidding when he told the crowd he had some famous friends. Also spotted in the crowd was Paris Hilton, Cuba Gooding Jr., Wesley Snipes, Russell Simmons, and members of 50's G-Unit.