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Take it from Caitlyn Jenner: Kourtney Kardashian will be more than "OK" post-breakup.

In a sneak peek clip from this Sunday's brand new episode of I Am Cait, Caitlyn opens up about Kourtney's recent split from longtime boyfriend Scott Disick.

Cait heads to lunch in Malibu with BFF Candis Cayne and Caitlyn shows off some new clothes. "I actually went shopping with Courtney," Cait says referencing her assistant Courtney.

"Which Courtney? Your daughter Kourtney?" Candis asks. "No. I did talk to her too," Cait says.

Caitlyn Jenner, Scott Disick, Kourtney Kardashian

David Becker/WireImage; E!

"Is she doing OK?" Candis asks of Kourt.

"Is she doing OK? She's doing as well as she can do under the circumstances," Cait admits candidly. "It's obviously very tough on her. Obviously Scott has a lot of issues and she's trying to deal with them the best she can. She's got three kids with him...She'll be OK. Relationships aren't easy."

"They're not easy at all," Candis adds.

Watch the video for yourself to see Cait's candid admission about Kourtney and Scott's breakup!

Watch a brand new I Am Cait this Monday at 9:30 p.m., only on E!.