It was an "uh-oh" move when Rihanna decided to invite her ex boyfriend Chris Brown for her intimate pre-birthday bash which happened on the night of Valentine's Day.

Rumors started to spread as Riri and Chris Brown were seen more frequently leaving same night clubs on the same nights. They've also been spotted both in attendance to same events. On February last year, Rihanna made a huge move when she asked the court to lift the restrictions between her and Chris Brown.

Even until now, most people remember the 2009 incident when Chris assaulted Rihanna causing her severe bruises and stitches most especially on her face. The Barbadian singer seem to have forgotten what happened when she made her advances and invited her ex boyfriend to a pre-birthday party held at a Beverly Hills mansion.

Other pop stars in attendance included Bruno Mars, Kelly Rowland and the newly single Katy Perry who is one of Rihanna's close friends. Katia C., a guest of the party tweeted:

"If Cupid was here he would be very happy everyone @Rihanna bday party was coupled up," the guest posted on her Twitter account the night of the party. "All I can say, CB was invited and she [Rihanna] was acting like the happiest girl on her birthday and probably got what she asked for," she then added.

An insider confirmed that Rihanna made sure that Chris was having a good time. However, the "With You" singer spent most of the time in a corner with a few friends. The source also said that Riri and Katy had everyone crazy by starting a cake fight by the end of the night.

"Rihanna and Katy had everyone going crazy. By the end of the night they started a cake fight and were dancing together while Bruno and Chris looked on open-mouthed, cheering," the insider reveals.

"At one point Katy danced so much she broke her heels and had to leave the party barefoot."

Also Read:

Are They Back Together? Rihanna Seen Partying Alongside Chris Brown

Liam Hemsworth on Girlfriend Miley Cyrus: 'She makes me really happy'