Here is the cast list from TV.com:
Celebrity Fit Club 4 features 8 new celebrities who will battle to lose weight, get in shape and take home valuable prizes. This all-new season features: Vincent Pastore (The Sopranos), Nick Turturro (NYPD Blue), Carnie Wilson (Wilson Phillips), Ted Lange (Love Boat), Bone Crusher (rap star), Tina Yothers (Family Ties), Angie Stone (R&B Vocalist) and Erika Eleniak (Baywatch). Meet them all as they face their first work out with Drill Sergeant Harvey Walden, IV and are divided into two teams as they weigh in for the first time with Harvey, diet expert Dr. Ian Smith and psychologist Dr. Linda Papadopoulos.
The only ones I know are Carnie Wilson, Ted Lange and Tina Yothers. Carnie I know will be a diva. The question is will she be a diva leader or a diva bitch.