Take this with a grain of salt, because the source has been less than reliable lately, but a new report in Us Weekly claims Rihanna and Chris Brown are hooking up!

With February 8 marking the three-year anniversary of Chris' infamous assault of his then-girlfriend, relations between the two have definitely thawed since.

They've been exchanging not-so-secret Tweets and rumors suggest that Rihanna may really want him back. But Us takes it a step further with this claim:

Rihanna and Brown are secretly hooking up - and have been for some time!

The edgy, platinum-selling "We Found Love" singer and Brown "meet up very casually," a Brown confidante says. "She comes to see him anytime she's in L.A."

"They can't get enough of each other. I don't see it ending well. Rihanna loves to live dangerously, and talking to and hooking up with Chris is all part of that."

Somehow we're not buying it.

Chris lays low for the most part, but Rihanna is photographed EVERYWHERE she goes and is enormously busy to boot. It would be pretty hard to pull that off.

Chris is also dating Karrueche Tran. Details. "He and Rihanna are just friends," Brown's rep says. "He's not cheating." Ri's rep, meanwhile, had no comment.

Regardless of this report ... SHOULD they get back together?