'Teen Mom' Amber Portwood Loses Primary Custody

5/11/2011 11:28 AM PDT

'Teen Mom' Amber Portwood Loses Primary Custody

"Teen Mom" Amber Portwood just lost primary custody of her baby daughter ... TMZ has learned.

Custody was awarded to baby daddy Gary Shirley instead -- after an Indiana judge decided he was a more suitable parent ... at least for the time being.

But it wasn't because Amber's an unfit mother -- according to court testimony today, Child Protective Services recommended that Gary have primary custody because of recent vandalism to Amber's  house and car.

CPS was nervous about Amber's living conditions -- so both parties agreed it would be best for baby Leah to stay with Gary until further notice.

Amber will have visitation rights -- but we're told, CPS hasn't come up with a schedule yet. So far, no word from Amber's camp.