BREAKING NEWS: Chris Brown And Rihanna LOCKED THEMSELVES In A Dressing Room Together For 5 HOURS . . . ALONE!!!

: So it looks like Chris Brown And Rihanna are back together . . . or at least they’re f*ckin. Here’s what our peeps over at RUMOR FIX had to say:

Sources tell RumorFix that the Barbadian beauty held up rehearsals for the Grammys on the Sony lot in Los Angeles, while she was behind doors with her ex.

Chris and Rihanna have been spending a lot of time together lately — including a Superbowl Party at the Greystone Manor in West Hollywood — but Chris’ girlfriend, Karrueche Tran, has always been in tow.

We are told that Karrueche was no where to be found on Monday, but Chris was with a male friend when he left Rihanna’s dressing room.

And the pop stars will probably be spending even more time together, because both Chris and Rihanna will be performing at the Grammys — although not together.

Well, who ain’t see THIS coming!!!