EXCLUSIVE ! CHRIS BROWN & RIHANNA BACK TOGETHER !!!!!

Rihanna and Chris Brown hit the studio together Tuesday night in L.A. for a late night session and didn't leave until the wee hours of the night. Could they be collaborating?

"When Chris and Rihanna left the studio, they weren't even trying to hide. They used to keep their relationship under wraps, but now they're fully out in the open. And they're totally okay with that."

We're told the 24-year-old songstress was in the studio for more than five hours with her beau.

These two are definitely inseparable!

Justin Bieber Cheated On Selena Gomez With Rihanna ! EXLCUSIVE!

While Justin Bieber and Selena Gomez are no longer together, their two-year relationship definitely lasted longer than most Hollywood couples’!

However, their relationship didn’t come without its fair share of troubles — and of course, some cray cray rumors thrown in there!

Reportedly, a friend of Selena’s recently spoke out about one incident back in 2011 that left Selenita “devastated.”

The claim? The Biebs supposedly was hooking up with Rihanna — yes, RiRi — on the side!!!

Wait… what?!

Yup! Allegedly, the friend dished that Bieber and Rihanna hit it off after flirting at an El Lay basketball game in February of 2011!