Former OC star Mischa Barton is rumoured to be dating Keira Knightley's ex-boyfriend Jamie Dornan, after the pair have been spotted looking cosy together.

Gorgeous Mischa was spotted leaving an Arcade Fire gig in Brixton, London, with model Jamie on Wednesday.

Onlookers said the pair were chatting and laughing, and that Mischa looked smitten.

The pair clearly has more than fame and good looks in common ? they have both modelled for Dior in the past.

The 21-year-old actress, whose character Marissa Cooper was killed after the third series of the OC, is thought to have met Jamie at an exclusive Cartier bash in London last summer.

Jamie shot to fame when he snapped up a modelling contract with Calvin Klein alongside Kate Moss.

Mischa was dating US rocker Cisco Adler for 18 months, but they split earlier this year.

After his two-year relationship with Keira Knightley ended in 2005, Jamie said he wanted to be single for a while.

However, the handsome model has been linked to a string of beautiful women, including Sienna Miller and Lily Aldridge, while a host of others including Lily Allen and Peaches Geldof have expressed an interest in him.

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? Adfero Ltd