At birthday bash...
Holly Frith
12:35 16th February 2012

Rihanna and Chris Brown have once again fuelled recent rumours that they are back together.

The singer and her ex Chris Brown spent Valentine's night together as they celebrated her birthday in LA alongside friends.

Katy Perry, Bruno Mars and Kelly Rowland all attended the bash in Beverly Hills on Tuesday.

A source told the Daily Mirror: '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.''

One party guest tweeted: ''If Cupid was here he would be very happy everyone @Rihanna bday party was coupled up.'

She added: '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.'

The pair both be performed at last weekend's Grammy Awards with Brown making first appearance at the awards since assaulting Rihanna back in 2009.

Rihanna - live