Johnson & Johnson Heiress Arrested for Theft

TMZ has learned Casey Johnson -- socialite and heiress to the Johnson & Johnson throne -- was arrested for grand theft today in Los Angeles.

Sources tell TMZ Casey was arrested at 12:30 PM in connection to items that were allegedly stolen from one of the heiress's former girlfriends.

We're told Casey was taken to the Van Nuys jail and is being held on $20,000 bail.