Rihanna kicked off a night of star-studded collaborations when she brought out a blindfolded Britney Spears to perform their "S&M" remix. The racy show, replete with a chair dance, bedazzled handcuffs and chains, ended in a sexy pillow fight and giggles.
Later on in the evening Nicki Minaj, after a performance of her latest single "Super Bass," brought Spears' out again for a fist-pumping performance of "Til the World Ends."
The Nicki-Britney, Britney-Rihanna combinations weren't the only major collaborations for the night. The Queen of Hip Hop/Soul Mary J. Blige teamed up with Lil Wayne for her single "Someone to Love" and Pitbull, Ne-Yo, and Nayer performed "Give Me Everything."
Beyoncé delivered the most electrifying performance of the night, however, doing an amazing rendition of her new single "Run the World (Girls)," and she also walked away with the Millennium Billboard Award.
(Photo: Ethan Miller/Getty Images for ABC)