Similar to the first three cycles, the fourth season of “Celebrity Rehab with Dr. Drew” will follow the real-life experiences of celebrity patients undergoing detoxification and treatment at the Pasadena Recovery Center. The show will include Jeremy London (“Party of Five,” “7th Heaven”), Rachel Uchitel (Infamous Party Planner), Janice Dickinson (“The Janice Dickinson Modeling Agency”), Leif Garrett (Musician), Frankie Lons (Keyshia Cole’s Mother), Jason Wahler (“The Hills”) and Jason Davis (Socialite).