Britney Spears, Rihanna's 'S&M' Remix Debuts (Listen)

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NYC radio station Z100 premieres the club tune Monday morning.

NYC radio station Z100 debuted Rihanna's remix of "S&M" Monday morning -- featuring Britney Spears.

Rihanna had been teasing the collaboration on Twitter.

"I got a #SEXY collabo comin your way supa dupa soon!!!! OH YEAH!!! By popular demand…." she posted. A little bit later, she added, "Its BRITNEY B-TCH!!!!"

Spears Twittered back: "You think they're ready Ri Ri?... -Britney"

Spears released her seventh studio album, Femme Fatale, last week. It debuted No. 1 on the Billboard chart.