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Jermaine Dupri will celebrate 20 years of So So Def with a star-studded concert tonight at Atlanta’s Fox Theatre. With hours to go until the big show, the So So Def boss shares rehearsal footage starring some of the artists on the bill.

Da Brat and J.D. trade rhymes on “That’s What I’m Looking For,” while Kriss Kross reprises their ’90s classic “Jump.” R&B supergroups Xscape and Jagged Edge also tinker with their performances in the behind-the-scenes footage.

Saturday’s star-studded lineup features past and present So So Def artists including Bow Wow, Bonecrusher, Dondria, and Anthony Hamilton, plus Nelly, Ludacris, and Usher.

If that wasn’t enough, Mariah Carey and Jay-Z are rumored to be participating in the festivities. Get a sneak peek at what you can expect and check out our interview with J.D.