T.I. made a surprise appearance at the 2010 Essence Music Festival.

The rapper, who I spotted backstage chillin with his boo Tameka “Tiny” Cottle and Grand Hustle funnyman, Lil Duval, hit the stage with Mary J. Blige for a crowd pleasing performance of their smash collaboration, “Good Love.”

More photos + watch video of Tip & MJB’s hot performance:

I sat through 3 whole days of concert performances and I can honestly say that the crowd’s response to T.I. and Mary had to be the loudest of them all…. [Sidebar: Janet’s “Discipline” performance was a close 2nd.]

Photos/Video: ExclusiveAccess + WireImage

CLICK HERE for more photos from the 2010 Essence Festival