Sandra Bullock is definitely not in hiding anymore — and she sure is working hard to put her heartbreaking personal scandal behind her. The star made a surprise appearance -- strumming a guitar, no less! -- in front of a cheering crowd at the Nashville Rising benefit in the Tennessee capital on June 22. “I’m gonna bring the house down!” Sandra joked while attempting to pluck some strings, though she quickly quit in defeat. “Ok, who am I kidding? I can’t play for crap!” With musicians like Taylor Swift, Carrie Underwood and Miley Cyrus at the event, which raised more than $2 million for flood victims, Sandra was clearly in talented company, but the audience applauded her efforts anyway. And Sandra can use any support she can get — she filed for divorce from husband Jesse James soon after In Touch exposed his secret affair with a tattoo model in March.