Oh, how those girls like to tease!

Rihanna and Britney Spears have announced via Twitter that they are apparently planning to collaborate on a song.

Both singers wrote about the forthcoming project on Twitter Sunday.

Rihanna announced it first, writing: "I got a sexy collaboration coming your way super-dupa soon! By popular demand... it's Britney [expletive]!"

Spears then tweeted: "Rihanna you're such a tease! I like it, like it..."