Britney and RiRi unite for "S&M" remix.

Yesterday, after witnessing the best Twitter friendship develop between

Rihanna and Britney Spears, they revealed that they

would team up for a "RihRihmix" of "S&M."

The world held its breath until the song was released on

NYC's Z100 radio station this morning.

I'm sure people's hearts stopped, because if you haven't heard it yet,

you MUST. It's one of the best masterpieces in world history.

FLAWLESS. BEAST. FIERCE. MAGICAL. SEXY.

Haven't heard it yet? You should; you can HERE.