LATEST: British pop hunk Robbie Williams celebrated his release from rehab by shopping and partying in Los Angeles. The former Take That singer, 33, checked out of the The Meadows rehabilitation centre in Arizona on Tuesday (06MAR07) following a 21-day treatment for addiction to prescription pills. Williams will continue to seek day treatment in Los Angeles, where he is staying with his mother JAN. Following his release, Williams went shopping at department store Barneys in Beverly Hills, California before meeting some pals at Winston's nightclub. His sister SALLY says, "He felt uncomfortable staying in there (rehab) so he had to come out and is going to use another facility. There is a process that they go through and he hasn't completed all of the steps that they like you to do, so he is going to finish the work elsewhere. "I think he is a lot better than he was but obviously he has not completed his course so he needs to continue. He is very serious about it."