Robbie Williams in rehab

The popular English singer Robbie Williams celebrated his 33rd birthday Tuesday by checking into a United States rehab center.

"Robbie Williams has today been admitted into a treatment center in America for his dependency on prescription drugs," spokeswoman Bryony Watts said. "There will be no further comment on this matter."

Williams, who has been living in the Los Angeles area the past few years. He has a history of drug addictions. He was treated for drug and alcohol addiction after his boy band Take That split up in 1995.

Williams spoke about his experience with depression and drugs in a BBC documentary on bipolar disorder last year. "My first drug of choice was probably fantasy," he said. "Fantasising about being an actor or being a singer, going to the moon, whatever. And I don't know if that was to escape a depression.

"Cocaine gave me a twitch and drink just made me ill. So all the props I had just had to be removed."

While he admitted to overcome the binge use of alcohol and cocaine that sent him into the Clouds rehab centre in Wiltshire after his band 'Take That' split, now anti-depressants appears to have resurfaced the familiar demons again.

While publicists refused to disclose his location, Williams is widely believed to be at the exclusive Meadows clinic in Arizona, a multidisorder facility, that serves individuals seeking treatment for and recovery from toxic and abusive living.