05/15/2012 08:00 am ET

The Kardashians Talk Dirty To Jay Leno On 'The Tonight Show' (VIDEO)

The Kardashians visited "The Tonight Show" (Weeknights, 11:35 p.m. ET on NBC) en masse Monday night to promote the upcoming Season 7 premiere of "Keeping Up With The Kardashians."

Host Jay Leno gestured to the very pregnant Kourtney Kardashian and joked, "You’ve really let yourself go." To which she replied, "I know -- too much In-N-Out."

Ooops! Kim Kardashian tried to cover up her sister's inadvertently dirty joke, but only made it worse. "Five Guys," she interjected, "Five Guys."

Badum-bing! Leno quipped: "I assume you’re talking about the hamburger."

The smut continued when the sisters gave Leno a gift of a cat bed, fully equipped with their own linen. He took a black light to it to check for stains.

Season 7 of "Keeping Up With The Kardashians" premieres Sunday, May 20th at 9 p.m. ET on E!. "The Tonight Show" airs weeknights at 11:35 p.m. ET on NBC.

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