Mischa Barton has reportedly split from boyfriend Cisco Adler - again.The actress, who plays Marissa Cooper in popular teen drama 'The O.C.', has allegedly called time on the pair's romance after the Whitestarr rocker complained she was partying too much.According to Britain's Daily Star newspaper, Barton, 20, was less than impressed when Adler, 26, told her he was unhappy with the amount of time she was spending with close friend Nicole Richie and dumped him.Last month, it was reported the pair had split after a heated argument at the Beverly Hills hotel, in Los Angeles.At the time, friends claimed Barton and Adler had found it difficult to stay together because of the intense public interest in their romance.However, the two later reconciled despite reports suggesting the brunette star had turned to 'Brokeback Mountain' actor Jake Gyllenhaal for comfort in the wake of their separation.

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