Rehab is the latest accessory, and celebrities are filling up on it!

Co-host of "The Insider" Pat O'Brien has checked himself into rehab once again. His employer posted this on their website:

"'The Insider' co-host PAT O'BRIEN has entered a rehabilitation facility for treatment. O'Brien and his doctors felt this is the best course for maintaining his sobriety."

That has to be embarassing. Imagine having to tell your boss you're in rehab, much less having them post it on their website.

This is O'Brien second run at rehab. Pat went to rehab in 2005 after his infamous voicemail looking for "blow" and "hookers".

P.O.B. is a veteran of CBS Sports and "Access Hollywood".