Rihanna Says Britney Spears' 'S&M' Remix 'Had To Be Major'

'It's very strange: Britney never does features,' Rihanna explains.

What happens when the Femme Fatale herself teams up with one of the Loudest singers in the game? Well, you get the sexy, saucy [article id="1661683"]remix of Rihanna's "S&M" featuring Britney Spears[/article], which dropped Monday (April 11).

The same day the track became available for public consumption, Rihanna called into New York radio station Z-100 to talk about getting the pop star on the track. "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. In order to do a remix, it had to be major," she explained. "I asked my fans last week who they wanted me to collaborate with, and Britney was one of the most popular names."

Rihanna did in fact ask her fans and her 4.4 million Twitter followers to weigh in on who they would want to see on the song. They wanted Britney, and that's who they got.

"It's very strange: Britney never does features. It was really amazing that she really wanted to be part of this song," Ri explained on Elvis Duran and the Morning Show. "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.' "

The duet has really turned into quite a Twittermance for the two feisty ladies. The pair was trading playful tweets with one another over the weekend, teasing the track. After Rihanna called her "gangsta,"

target="_blank">Spears replied, "You ain't so bad yourself honey."

Was Britney Spears the right choice for the "S&M" remix? Sound off below!