Rihanna and Chris Brown Rihanna and Chris Brown

It's been just over three years since singer Chris Brown attacked then-girlfriend Rihanna at a pre-Grammy Awards party in 2009, but it seems the former couple has reconciled.

The duo collaborated on two new songs that were released earlier this week. Rihanna is featured on Brown's "Turn Up The Music," and similarly, Brown sings on a remixed version of Rihanna's "Birthday Cake."

Chris Brown pleads guilty to assault, gets probation

As a result of the February 2009 incident, Brown was charged with felony assault and making criminal threats against the Barbados-born singer. He ultimately took a plea deal, which reduced his punishment to community labor and five years' probation.  A year ago, Rihanna's restraining order against Brown was reduced.Brown, who returned to the Grammy's on Feb. 12 for the first time since 2009, performed twice at the award show, and took home the Grammy for Best R&B album. Listen to "Birthday Cake" here

, and "Turn Up the Music" here.Do you think it's appropriate for Brown and Rihanna to work together again?