Chris Brown and Rihanna are back together, musically speaking.
Two songs featuring the singers have hit the internet. Chris sings on the remix of Rihanna's track Birthday Cake, and she appears on the remix of his upbeat tune Turn Up The Music.
The R&B star tweeted a link to the new version of Turn Up The Music which Rihanna later retweeted. She also tweeted about the remix for Birthday Cake.
Chris admitted assaulting then-girlfriend Rihanna at a pre-Grammy Awards party in 2009.
He is serving five years of probation for the attack.
He made his return to the Grammys this year, performing twice and winning best R&B album.
The singer also tweeted his birthday wishes to Rihanna, who turned 24 on Monday.
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