Khloe Kardashian Freaks After Rob Sleeps With Her BFF

Entertainment Sep. 24, 2010 AT 7:58AM

On Sunday's Keeping Up With the Kardashians, Khloe cringes when she sees her brother Rob - wearing nothing but briefs - give her BFF a peck on the cheek.

"You guys are so weird together!" she says in the clip above.

She gets disgusted the more she thinks about it.

PHOTOS: Khloe's wedding - a look back

"So, did you guys have sex?" she finally asks before.

Her pal's answer causes her to let out a huge shriek.

Watch Keeping Up With the Kardashians Sunday at 10 p.m. (EST) on E!

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