Grey's Anatomy star Justin Chambers checked into the psych ward of the UCLA Medical Center on Monday and checked out yesterday, TMZ.com reports. Chamber's rep told TMZ that the actor, husband and father of five, was "exhausted and suffers from a sleeping disorder." "He went in voluntarily to get some help," the rep said. Chambers was in the same ward where Britney Spears is currently staying , according to TMZ. In 2001, Mariah Carey was also treated at the UCLA Medical Center for an ...