The Internet has been buzzing that Chris Brown was going to appear on a song with his ex-girlfriend, Rihanna, but the former couple has one-upped the gossip. On Monday, they revealed that they've collaborated on not one, but two songs together.

Yesterday evening, Brown tweeted a link to a downloadable remix of Rihanna's explicit "Birthday Cake" track featuring his vocals.

Rihanna followed suit, tweeting a link to a remix of Brown's "Turn Up the Music," which features her on a verse. She wrote along with it,"@chrisbrown Turn up the music remix #RihannaNavy #Teambreezy enjoy!!!"

Brown, 22, and Rihanna, who just turned 24, made headlines earlier Monday when Brown wished Rihanna a happy birthday via Twitter.

Much of the buzz was focused on the two's communication following their highly publicized 2009 domestic disturbance before that year's Grammys show. In June of 2009, Brown pleaded guilty to one count of assault with the intent to do bodily harm.

What do you think of their collaborations? "Birthday Cake" is too explicit for us to embed here, but Chris Brown's "Turn Up the Music" remix is embedded below: