Celebrity Rehab 2010 cast: Jason Wahler, Jason Davis, Rachel Uchitel to appear on Celebrity Rehab 4

"Celebrity Rehab with Dr. Drew" premieres its fourth season tonight on VH1. The cast includes Jeremy London, Janice Dickinson, Jason Wahler, Rachel Uchitel, Leif Garrett, Jason Davis and Frankie Lons.

The show airs at 10 p.m.

Don't recognize the cast members? Here's a quick roundup:

Jason Wahler briefly dated Lauren Conrad on "The Hills." She skipped a trip to Paris so they could be together. Big mistake.

Janice Dickinson judged "America's Next Top Model" and appeared on "I'm a Celebrity...Get Me Out of Here."

Jeremy London appeared on shows like "Party of Five." He recently made headlines when he was allegedly kidnapped.

Rachel Uchitel allegedly had an affair with Tiger Woods.

Jason "Gummi Bear" Davis is an oil heir.

Leif Garrett is a former teen heartthrob.

Frankie Lons is Keyshia Cole’s mother.

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