Chris helps the singer celebrate her 24th birthday

Rihanna spent Valentine’s Day with ex-boyfriend Chris Brown after inviting him to her pre-birthday party in LA.

It was clear that the Bajan singer, who turns 24 on Monday, has forgiven Chris, 22, for violently assaulting her in 2009, according to one party-goer.

‘If Cupid was here he would be very happy everyone @Rihanna bday party was coupled up,’ Tweets guest Katia C.

‘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.’

Ri-Ri partied with a host of celeb friends at the bash in a Beverly Hills mansion.

Stars including Bruno Mars, Kelly Rowland and the newly-single Katy Perry joined Chris to help her celebrate on Tuesday night.

Rihanna and Katy had everyone going crazy,’ a source tells the Daily Mirror.

‘By the end of the night they started a cake fight and were dancing together while Bruno and Chris looked on open-mouthed, cheering.

RiRi made sure Chris was having a good time but then he kept a low profile, spending most of the night in a corner with a few pals.’

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Anna Duff