The Real Housewives of Beverly Hills cast is apparently complete.

Camille Donatacci Grammer, the wife of former Frasier star Kelsey Grammer, and Adrienne Maloof-Nassif, wife of former Dr. 90210 plastic surgeon Dr. Paul Nassif, will appear on the sixth installment of Bravo's The Real Housewives franchise, E! News reported Friday.

Grammer and Maloof-Nassif join Kim and Kyle Richards -- Kathy Hilton's sisters -- and Villa Blanca restaurant owner Lisa Vanderpump-Todd, whose involvement was previously reported in January.

"Everyone seems very happy to be on the show. They are all really very nice," a source told E! News. "Lisa is hilarious. She has that dry, British humor."

Grammer is a 41-year-old former Playboy model who has been married to the former Cheers star for 13 years. The couple has two children together. In addition to being married to Nassif, the 48-year-old Maloof-Nassif's family owns everything from the NBA's Sacramento Kings franchise to Las Vegas' Palms hotel and casino.

Bravo formally announced earlier this month that it had ordered The Real Housewives of Beverly Hills, which is being produced by Evolution Media -- the same production company behind the franchise's Orange County installment.