Rehab Madness

Within the last month, Britney Spears, Lindsey Lohan and ironically Amy Winehouse have all been to rehab. Now we can add Eva Mendes and Grey's Anatomy star Justin Chambers to the list. What the fuck is going on in Hollywood?

TMZ has learned actor Justin Chambers, Dr. Alex Karev on "Grey's Anatomy," checked himself in to the psych ward at UCLA Medical Center this week. Yes, it's the same place ...

His rep confirmed to TMZ that Chambers checked in on Monday and checked out yesterday.

The rep claims Chambers, a married father of five, was "exhausted and suffers from a sleeping disorder. He went in voluntarily to get some help."

Chambers was in the same ward where Britney is being treated.

Eva Mendes checked into Utah's Cirque Lodge and has been in the facility, which deals with substance-abuse problems, for several weeks.

"Eva has been working hard for the past year and made a positive decision to take some much-needed time off to proactively attend to some personal issues that, while not critical, she felt deserved some outside professional support. Out of respect for Eva's privacy, we do not wish to discuss further details," her rep told PEOPLE Friday.

Cirque Lodge became a familiar name last year, when Lindsay Lohan checked in for treatment. The substance for which Mendes is being treated has not been reported.

The news was first reported on TMZ.com.

What's up with all the substance abuse? Literally, it's like, who's next?