Our friend Heather has heard its 100% confirmed that both will appear on stage, but they won't be performing together. Justin will appear in 4 Minutes and do the same as in the "Hard Candy" promo tour performance. Dancer Paul Kirkland has been spotted rehearsing 4 Minutes with Madonna as a stood in for Justin.

Britney will be appearing of course during Human Nature and she's doing part of the song with Madonna.