Of course, we're talking about their 2004 mega duet "My Boo" -- which will undoubtedly be at least one of the tracks she performs.
The song topped the Billboard Hot 100 for 6 weeks when it came out -- and became the soundtrack to high school slow dances worldwide. It'll be interesting to see where the slow jam is included in the track list ... but he'll have plenty of time to squeeze it in.
Remember ... Usher negotiated to have a 15-minute set as opposed to the originally allotted 13 minutes .