Rihanna marked her 24th birthday by releasing her hotly-anticipated duet with ex-boyfriend Chris Brown on Monday.

The "Umbrella" singer took to her Twitter page on her big day to share the ex-couple's sexually-charged collaboration "Birthday Cake," a remix of an interlude featured on her latest album "Talk That Talk."

The raunchy track proves the pair's notorious 2009 bust-up is firmly in the past as Brown sings to Rihanna, "Girl, I wanna f**k you right now. Been a long time, I've been missing your body. Let me turn the lights down, when I go down it's a private party..."

The controversial stars didn't stop there - Rihanna returned the favour by recording vocals for a new version of Brown's "Turn Up The Music," which he also posted online for fans.

The two songs have arrived three years after the stars split following Brown's arrest for assaulting Rihanna on the eve of the 2009 Grammy Awards.

The altercation landed Brown a conviction and saw him sentenced to probation and community service, while he was also ordered to stay away from the "Umbrella" hitmaker.