Britney Spears joined Rihanna on stage at the 2011 Billboard Music Awards for a sexy performance of "S&M." Watch their duet:

What viewers didn't see, however, was a quick smooch between the two pop stars at the end of the duet. The kiss didn't linger like Spears' infamous kiss with Madonna at the 2003 MTV Video Music Awards, but ABC didn't take any chances and quickly cut away to a shot of the audience. We have the photo though, and more shots from the show below:


Meanwhile, millions of hearts were broken when Justin Bieber kissed girlfriend Selena Gomez after he won the Top New Artist Award.

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