Somebody's been paying attention to her Renee Zellweger headlines.One Tree Hill star Sophia Bush filed for annulment from her five-month marriage to her cheatin' costar Chad Michael Murray. She cited "fraud" as the reason she wants her marriage made invalid.The couple split in September amidst rumors of infidelity. Chad was linked to numerous people during their brief union, including Paris Hilton and a stripper.If you remember, back in September Renee started a whole big to-do when she annulled her five-month marriage to Kenny Chesney on grounds of fraud. While everyone scrambled to try to figure out what exactly the fraud was (did she find out he was bald under that 10-gallon hat?), she released a statement saying that the term "fraud" was just legal language and did not imply anything about Kenny's character.Renee must have been serious because she still hangs with Kenny now and then. Don't expect the same for Chad and Sophia. Despite working together on the same set, they avoid each other as much as possible.