AceShowbiz -

Two big female singers in the game, Rihanna and Britney Spears, get naughty in an official remix of "S&M". Premiered Monday morning, April 11 on Z100's "Elvis Duran's Morning Show", the revamped tune features the red-headed R&B performer and the blonde pop beauty trading suggestive verses with each other.

The remix has similar beat with the original one, but it adds Britney's extra racy lines. "Just one night full of sin/ Feel the pain on your skin," the Southern Belle coos. "Tough, I don't scream 'mercy'/ It's your turn to hurt me/ If I'm bad, tie me down/ Shut me up, gag and bound me/ 'Cuz the pain is my pleasure/ Nothing comes better."

Recalling how the idea of bringing Britney came to her mind, RiRi told radio host Elvis that it's actually a fan request. "At first, we didn't know what the song was going to do because of the lyrics, but it became really big on radio and it's #1 at Pop this week," she explained. "In order to do a remix, it had to be major. I asked my fans last week who they wanted me to collaborate with, and Britney was one of the most popular names."

"It's very strange: Britney never does features. It was really amazing that she really wanted to be part of this song," she went on. "She really liked the song to begin with, but it was a different story when she had to sing it, and she really wanted to be a part of it. It made it really special, because you never see two pop female artists doing songs together anymore. Just call us 'R&B.' "

When asked whether she also wants to do a music video with Britney, she said, "I hope so. I wanna spank her."