It's a Sister Showdown! Watch WAGS' Olivia Pierson Confront Sophia for ''Ha…

Don’t mess with Olivia Pierson‘s man!

In this clip from this Sunday’s all-new episode of WAGS, she confronts her sister, Sophia Pierson, after finding out she was hanging out and taking pictures with her boyfriend, Marcedes Lewis, behind her back while she was away at New York Fashion Week. To make matters worse, Liv also catches her wearing her shirt and heels without permission.

“You’re so immature, and you’re so f–king lame,” Olivia tells her. “I saw the photo of you and Marcedes, mid-fashion show. So, thanks!”

But Sophia is so surprised by her sister’s reaction. “Why would you care if I’m hanging out with Marcedes?” she asks. “How is it even a big deal? We’re having drinks, we’re doing shots. We’re all hanging out.”

However, Olivia isn’t convinced it was so innocent and wants to know how it all went down. “Did you call him? Did he call you?” she asks.

“Yeah, we were Snapchatting and he was in the area so I told him to come by,” Sophia explains. “But it was nothing. Like, I’m telling you, it was nothing.” Sophia eventually gets fed up with the interrogation and storms out of the apartment—with her Olivia’s shoes and clothes.

Check out the sister showdown in the video above!