NEW AUDIO: Listen To Rihanna & Chris Brown’s Duet ‘Turn Up The Music!’

Rihanna and Chris Brown are back on — professionally at the very least.

Following last week’s Twitter exchange between the exes — initiated by Brown when he wished Rihanna happy birthday — the pair are now collaborating on two remixed singles: her song “Birthday Cake” and his song “Turn Up the Music.”  The collaboration comes three years after Brown assaulted Rihanna in a car in L.A.’s Hancock Park neighborhood.

Brown’s first line in Birthday Cake? “Girl I wanna f*** you right now. Been a long time, I’ve been missing your body.”

Meanwhile, Rihanna tweeted a link to “Turn Up The Music” Monday. Listen to it below:

 

Chris Brown Wishes Rihanna Happy Birthday!

They just can’t move on from each other!

On Monday, when Rihanna turned 24, her ex-boyfriend Chris Brown — who assaulted her three years — tweeted “HAPPY BIRTHDAY ROBYN!”

A few hours later, Rihanna tweeted “Thanks!”

A source tells Us, “Rihanna loves to live dangerously…Talking to and hooking up with Chris is all part of that.”  A rep for Brown also told Us, “He and Rihanna are just friends.”