ABC Didn't Air Britney-Rihanna 'Billboard' Kiss

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They smooched on stage during a live performance of "S&M," say reports.

Billboard Music Awards viewers saw Justin Bieber and Selena Gomez smooch, but apparently they missed one notable piece of PDA.

Britney Spears and Rihanna kissed on stage while performing a remix of Rihanna's "S&M," but the same sex smooch was never broadcast on the small screen, notes Gawker, which posted a minute-by-minute account of the incident.

The post reads: "At left is video of the performance. At 4:02 the ladies go in for a hug. At 4:03 the camera cuts to the cheering audience. At 4:05 we return to Britney and Rihanna pulling apart. We missed the (incredibly brief) kiss!"

In 2003, Spears made headlines when she and Madonna shared an open-mouth kiss at the MTV Video Music Awards.