Rihanna & Usher hook up!

Rihanna has been getting hot and heavy with Usher!

The sexy pair were seen getting hot and heavy during at the recent Coachella music festival, OK! magazine reports.

“They were so flirty,” a source said.

“They left holding hands.

“They’re having fun and hooking up.

“They have a lot of mutual friends; we’re surprised it didn’t happen sooner!