Looks like those rumors were true -- Chris Brown and Rihanna were collaborating on new music ... and it's more than one song!

The two stars, who have a very volatile past together, are featured on remixes for each other's songs.

Earlier tonight, Rihanna tweeted "@ChrisBrown Turn up the music remix #RihannaNavy #Teambreezy enjoy!!!” before posting a link to the remix for Brown's "Turn Up the Music."

Listen to the track below, fittingly played over the word "YIKES!!!!!!!!"

The two also released a remix of Rihanna's "Birthday Cake" -- and while it's harder to track down, you can listen to it here for now. Fitting that the song was released on Rihanna's 24th birthday.

Now that the songs are here, we have to ask: Was this a irresponsible move for Rihanna?

Brown pled guilty to felony assault after violently abusing Rihanna before the 2009 Grammy Awards ... so is getting back in the studio with him saying that it's all O.K.?

Or is it time to move on?

We really want to know what you think on this one ... sound off below.