The battle lines were drawn in the Real Housewives of Beverly Hills Season 3 reunion. Yolanda Foster and Kyle Richards were on either side, and it was only a matter of time before their co-stars made their allegiances clear.

Yolanda began by calling Kyle two-faced for saying something about Brandi Glanville and plastic surgery behind the former model’s back in Las Vegas. Kyle shot back that maybe Yolanda should tell Lisa Vanderpump what she’d said about her in Paris.

When Yolanda claimed not remember saying anything about Lisa, Kyle summed up: “That she’s a phony, and she’s a fake.” According to Kyle, Yolanda told her and Kim Richards that Lisa is “full of s**t” and didn’t care about Kim.

While the ladies were in Paris, Kim appeared confused and disoriented. It turned out she’d taken the wrong medication, but Lisa asked if the recovering alcoholic had taken sleeping pills then joked that she’d invited the women to a cooking class to get Kim out her room. “I was being light-hearted,” Lisa explained at the time.

As Yolanda and Kyle continued to argue at the reunion, the Dutch model told her co-star, “You’re a liar.” However, Kim backed her sister up, saying, “You said, ‘she’s not your friend, she’s full of s**t.’”

When asked which story she thought was true, Lisa said she didn’t believe Kim and Kyle.

We’ll have to wait until Part 2 of the reunion, airing at 9 p.m. next Monday, to see how the rest unfolds — especially after Andy Cohen says to Lisa, “You think Kyle is kind of a liar.”