Kendall Jenner Goes Full Pin-Up Girl in Sexy Bikini Shot -- See the Pic!

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Kendall Jenner goes retro!

The 21-year-old model rocked her best pin-up style while posing in a sexy bikini on Tuesday.

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"???," Jenner captioned the shot, referring to her "Pizza Boys" cropped tee.

The brunette beauty's vintage style didn't stop there. Jenner sported another retro look in a mirror selfie captioned, "rest of 2017."

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Jenner wore plenty of '50s and '60s-inspired looks while vacationing in Cannes, France, with her sister, Kourtney Kardashian, and rumored boyfriend, A$AP Rocky, last month. 

See more in the video below.