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Kendall Jenner

Instagram

Nothing comes between Kendall Jenner and her Calvins.

The 19-year-old Keeping Up With the Kardashians star took to Instagram earlier today to show off her booty in a pair of white Calvin Klein undies ahead of her upcoming new campaign for the fashion brand.

The sexy snapshot shows the brunette beauty arching her back while sitting on her bed. Kendall's waist looks super skinny as she flaunts her bum in the underwear and low-rise jeans. "#DenimDay," she captioned the hot photo.

But a thin tummy and curvaceous butt aren't the only things Kendall is rocking in the CK selfie. We couldn't help but notice the model appears to be topless with a little hint of under boob popping out at the top of the shot.

Kendall Jenner, V Magazine

Courtesy Steven Klein/V Magazine #95

Kendall also recently graced the pages of V magazine in some sexy Calvin Klein underwear. She gushed of her new CK campaign, "This will be my first billboard on Sunset, which I'm ecstatic about. It's really humbling, and honestly, I am a pretty shy person, but being part of the Calvin campaign and seeing myself up there will be a dream come true. I might have to eat every night at the Chateau Marmont with that hanging over my shoulder. 'Oh yeah, that little thing? I didn't notice!'"

Kendall also revealed she faced obstacles and bias from people in the fashion industry when she first started modeling.

"You have no idea how many doors closed on me and how many adults were either initially reluctant to take a chance working with me or who outright laughed at me behind my back," she said. "It was kind of hard because all I was doing was going on go-sees, trying my best to break into this business as a teenager. I am so grateful to Marc Jacobs, Riccardo Tisci, Karl Lagerfeld, and Katie Grand, who took a chance on me that first season and gave me an opportunity. My parents taught me that work ethic is one of the most important keys in life, and I believe it."