According to TMZ, Justin Chambers, aka Dr. Alex Karev of Grey's Anatomy, voluntarily checked into the UCLA Psych Ward this week. His rep said he checked in on Monday and checked out yesterday. The rep told TMZ that the doc was "exhausted and suffers from a sleeping disorder and went in voluntarily to get some help." Exhausted? But he hasn't had to work in months! Then again, he does have five kids at home -- maybe that did it :) Or perhaps he just wanted to visit Britney.