The much-anticipated reunion of the exes that was to take place on Madonna's stage last night didn't totally happen. Instead, Britney Spears and Justin Timberlake each did their own duet with the Queen of Pop. Brit came out first in a white ruffled shirt and black trousers, singing the last verse of Madonna's song, "Human Nature." Madonna pointed to her protege and screamed, "She's not your b*tch!" Madonna spun Britney around and then kissed her hand. Justin came on later to sing "4 Minutes" to an audience that included Jennifer Lopez, Heidi Klum, Carrie Underwood, Dennis Quaid, Fergie, Kate Moss and Hayden Panettiere. credit: intouch