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Someone's lips are not sealed!

In this clip from Sunday's all-new episode of Keeping Up With the Kardashians, Kris Jenner is seriously upset with Kim Kardashian for spilling the beans about Kendall Jenner's Victoria's Secret runway debut to Caitlyn Jenner. The supermodel didn't want any of her family members to attend the show and cause a frenzy, but Kim still thinks it's important for her dad to be there to support.

"She doesn't want one person there," Kris explains.

"But, you can go?" Kim asks.

"I'm going to be backstage with Kendall," Kris replies. "It's something that we've worked one since day one."

"So, tell her to tell Caitlyn because Caitlyn's going," Kim says.

"Because you opened your big mouth when I said, 'Please, don't say a word to anyone!'" Kris snaps.

"I thought her dad should know that she is fulfilling one of her lifelong dreams!" Kim counters.

Check out the clip above to see their argument!

New episodes of Keeping Up With the Kardashians return Sunday, Oct. 23 at 9 p.m., only on E!