Kim Richards Faces Off with "Sweet Little Barbie Doll" Heidi Montag

Both Kim Richards and Heidi Montag know a thing or two about confronting fellow castmembers on reality TV. So when the two women butt heads on Lifetime's The Mother/Daughter Experiment: Celebrity Edition, you can bet that neither of them is going down without a fight. In a preview ahead of Friday's episode, Kim and Heidi clash in a big way, with The Real Housewives of Beverly Hills alum referring to the former Hills star as a "sweet little Barbie doll" in a not exactly sweet way. The war of words comes after Heidi takes issue with Kim showing up late for group therapy. Kim and Heidi face off in a hallway, while the other mother-daughter pairs look on. "Hey, Heidi, I just wanted to say, sweetheart, I personally didn't like what you just did to me in that room by coming to me after not one of these people have said [anything], not one of these people has complained," Kim says in the preview, via Entertainment Tonight.

Kim appears on the series with her youngest daughter, Kimberly Jackson, in effort to work on their complicated relationship. In addition to Kim and Kimberly and Heidi and her mom Darlene Egelhoff, other celebrities on the emotional series include Courtney Stodden and her mom Krista Stodden; Bad Girls Club's Natalie Nunn and her mom Karen; Kevin Federline's ex, Shar Jackson and her daughter Cassie; and Hollywood Exes star Jessica Canseco and her daughter Josie.

Check out photos of Kim and her family through the years, below.