Britney Spears & Rihanna Heat Up Billboard Awards

Britney Spears and Rihanna perform onstage during the 2011 Billboard Music Awards at the MGM Grand Garden Arena in Las Vegas on May 22, 2011 Britney Spears and Rihanna perform onstage during the 2011 Billboard Music Awards at the MGM Grand Garden Arena in Las Vegas on May 22, 2011

Britney Spears joined Rihanna at the Billboard Music Awards on Sunday night for a racy performance that left the crowd on their feet cheering for more!

The Pop Princess joined Rihanna midway through “S&M,” emerging from the floor wearing only a mask and a black pantless latex bodysuit – RiRi sported a matching white bodysuit.

The duo writhed their way across the stage and both simultaneously pole danced and then ended the number with a playful pillow fight.

(Check out the performance HERE!)

The crowd appeared to love the duo’s racy performance, giving Brit and Rihanna a standing ovation as it ended.

Britney was heavily featured during Sunday’s show from Las Veags. She was show on camera multiple time in the audience with boyfriend Jason Trawick and when Lady Antebellum won Country Song of the Year, they exclaimed, “There’s Britney Spears!” from the stage.

The star sent a vague, but cheerful, Tweet on Sunday, writing, “I like it, like it…. –Britney.”

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