Rihanna and Chris Brown Collaborate, Fueling Their ‘Rumored Relationship’

Three years after their relationship led to an abusive ending, Rihanna and Chris are back together, but this time for a collaboration.

Former lovers Chris Brown and Rihanna released a remix of his new single "Turn Up The Music." It might stun the fans and the world to know that the two collaborated in not only one but two songs. Not to mention the many instances that the two have been spotted at the same place, it only fuels the rumors that romance might be starting again.

The "We Found Love" star who is currently in London for the Brit Awards has also come together with Brown for an X-rated remix of her single "Birthday Cake." Reports say that Brown will also make a cameo appearance for the video.

Although the "Turn Up The Music" lyrics had a friendlier approach, Rihanna's "Birthday Cake" lyrics were more vulgar. Fans of the two have expressed their disappointment to the collaboration taking it to social networking sites like Twitter.

On Rihanna's birthday, Brown tweeted a "Happy Birthday Robyn!" which was the female singer's real name. She then retweeted her ex's post and thanked him for it.

A source said to US Weekly that the Barbadian singer loves living dangerously and hooking up with Brown is part of it. However, Chris' spokesperson denied the rumors and said that the two are just "friends."

Chris who has won his first Grammy Award this year for his album "F.A.M.E." is believed to be in a relationship with aspiring model Karrueche Tran although last week, sources confirm that Chris attended Rihanna's pre-birthday bash on Valentine's Day.

Scroll down for the two remix collaborations of Rihanna and Chris Brown.