Jason Wahler, Janice Dickinson Sign On for Celebrity Rehab

 Maury Phillips ; Steve Granitz/WireImage

Jason Wahler and Janice Dickinson are among the stars set to appear on the fourth season of VH1's Celebrity Rehab, the network announced Sunday.

Guided by Dr. Drew Pinsky, seven celebrities will take part in the series that chronicles their 21-day detoxification and treatment program at The Pasadena Recovery Center in Pasadena, Calif.

Joining Wahler and Dickinson for the series are Party of Five star Jeremy London, former Tiger Woods mistress Rachel Uchitel, musician Leif Garrett, socialite Jason Davis and Frankie Lons, the mother of singer Keyshia Cole.

Earlier this year, former Hills star Wahler opened up to UsMagazine.com about his six alcohol-related arrests in recent years.

"I think everything happens for a reason," Wahler, 24, told Us after he was arrested in March following an alleged booze-fueled club brawl. "God did that to me, so maybe I would be at [rock] bottom and want to climb my way to the top.

"If I don't stay sober," he tells Us, "I am not going to have a life."

The fourth season of Celebrity Rehab is scheduled to premiere on VH1 later this year.

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