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Something's different about Khloe Kardashian's face and her sisters Kim Kardashian and Kourtney Kardashian want answers!

In this exclusive preview clip from Sunday's season 11 finale of Keeping Up With the Kardashians, Kim, Kourtney and Jonathan Cheban call Khloe after noticing her smile looks different.

"Khloe, I was gonna call you and talk to you last night about this," Kim says to Khloe on the phone. "Your whole face has changed. Did you do any filler?"

"No, I haven't!" Khloe insists.

KUWTK, Kourtney Kardashian, Kim Kardashian, Khloe Kardashian

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"[She has] the craziest laugh," Kourtney laughs.

"You haven't done any Botox?" Kim continues to ask while Khloe maintains, "No!"

"Khloe, your whole face changes when you laugh. It's like, I stare at you," Kim explains before asking Kourtney, "You noticed it?"

KUWTK, Kourtney Kardashian, Kim Kardashian, Khloe Kardashian

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"Yes!" Kourtney cracks

"I thought she was on drugs," Kim says. "It's like her whole gums and teeth," Kourtney laughs while pointing to a picture of Khloe. LOL!

So what does Khloe has to say about the teasing? Watch the hilarious clip to find out and check out Sunday's episode for more hysterical scoop on Khloe's face!

KUWTK, Kourtney Kardashian, Kim Kardashian, Khloe Kardashian

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KUWTK, Kourtney Kardashian, Kim Kardashian, Khloe Kardashian

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Watch a brand-new Keeping Up With the Kardashians Sunday at 9 p.m., only on E!