Sean "Diddy" Combs, Cameron Diaz and Alex Rodriguez chop it up at Diddy's Super Bowl Fantasy Party at Tower Building in Dallas, TX on February 5th 2011. (Photo: Johnny Nunez/Wire Image)

Who knew that Diddy and Cameron Diaz have been dating off and on since 2008? (And Isn’t he supposed to be with Cassie?)

A new report from US Weekly claims that the pair have been hooking up since Diddy first pursued Diaz during Oscars week back in 2008.

“Since then, when she’s single, she’ll booty call him,” an insider said.

On October 24th, the Hip-Hop mogul and the actress were “inseparable” and “they had their hands all over each other” in a booth at a New York restaruant, an eyewitness recalled.

Just two short weeks later on November 11th, Diddy and Diaz, who recently broke up with her boyfriend Alex Rodriguez of the New York Yankees, were seen “making out” and “acting romantic,” said another source.

Reps for both stars say that Diaz and Combs are “just friends” and were meeting to discuss a possible film project. They didn’t explain the “making out” and “acting romantic” part though.

But back to Cassie, who Combs has been rumoredly dating for the past few years. What’s up with that?

“Diddy’s single whenever there’s a better offer on the table!” a friend said.

Sounds like Diddy has a few “friends with benefits.” Play on playa!