Drinking when you're supposed to be going through rehab is bad.   Throwing a party IN THE REHAB CENTER is worse.    Lindsay Lohan and her new friends at the Betty Ford Clinic pulled it off, according to TMZ:

We're told Lindsay and her roomies were staying at a satellite house at the Betty Ford Clinic. The roommates were "drinking heavily" and somehow the Betty Ford people found out and busted them.

The roommates were moved back to the main facility at Betty Ford, which has more supervision.

As for Lindsay, we're told there was no evidence she had been drinking, but we're told after the incident Betty Ford officials decided Lindsay could not leave the area for Christmas.

We're also told Lindsay has gone back to the main Betty Ford facility, not for punishment but for "intensive therapy."

By the way, sources connected with Lindsay are telling us she went out with two of her roommates the night of the party to a bar. We could not independently confirm the story, however, again, we're told there's no evidence Lindsay was drinking.

via TMZ.com.