If Britney and Rihanna can get press out of that Billboard "performance", then so can Beyonce and Gaga, they are better performers despite of what you like or dislike.
Why would Beyonce promote Lady's gaga's album and old ass horrid single? Beyonce would only murder the chick on stage as far as performance and beauty, it would be embarrassing for the girl.
Plus, the chick just said she hates her own song, telephone
A production source tells The Hollywood Reporter that in addition to U2's Bono and The Edge (who are performing with the cast members from Spider-Man: Turn Off the Dark), show judge Steven Tyler will be singing onstage.
And, he'll be in good company. According to the source, the Aerosmith frontman will be joined by Carrie Underwood, Lady Gaga and Beyonce who will perform a group medley along with contestants Scotty McCreery and Lauren Alaina.