Actress Sophia Bush has applied for her five-month marriage to her One Tree Hill co-star Chad Michael Murray to be annulled, citing fraud. The 23-year-old, who separated from Murray, 24, in September (05), has filed documents with the Los Angeles Superior Court. In October (05) a friend of Bush's told People magazine, "Sophia went into the marriage believing in the sanctity of marriage, and Chad simply did not share that vision." Hollywood divorce attorney SORRELL TROPE said fraud claims are "difficult to prove", and advises the star to take the case to the divorce courts should her annulment application fail. The actress has recently been linked with a number of stars including actors Jake Gyllenhaal and Austin Nichols.