“Laguna Beach” bad boy Jason Wahler has moved out of the ritzy beachside community made famous on his MTV series – and checked into drug rehab.

The ENQUIRER has learned exclusively that Wahler – who shot to fame as one of the spoiled rich kids on the hit reality show – is battling addictions to alcohol and drugs at the Chapman House treatment center in California’s Orange County.

“Thank God he’s getting help, because his hard partying has definitely taken its toll,” a pal of the troubled 20- year-old tells The ENQUIRER.

“He needed to hit rock bottom – and judging by the look of him, he definitely has.”

On April 8 Wahler was arrested for the fourth time in nine months after allegedly punching a guard at the Seattle Marriott Waterfront hotel. He was charged with assault and criminal trespassing and released on $1,140 bail.

His previous run-ins with the law include a battery charge resulting from an altercation with a tow-truck driver and public intoxication.

The judge ordered Wahler to attend AA meetings, as well as anger-management classes.

Wahler also made headlines recently when wild rumors flew that he’d made a sex tape with his exgirlfriend Lauren Conrad, his co-star on “The Hills.”

His mother Denese Wahler confirmed that Jason is in rehab and admitted that “small traces of drugs” were found in his system. But she said alcohol is his primary problem.

“We all love and support Jason,” Denese told The ENQUIRER in an exclusive interview. “The whole family is standing behind him.”