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Kendall Jenner, NYFW

Nancy Rivera / Splash News

Some people get matching tattoos and others get matching piercings. Kendall Jenner and Kylie Jenner have opted for the latter, choosing to both get one of their nipples pierced.

Although it has been speculated for a while that Kendall took the plunge, it wasn't totally obvious until she hit the red carpet at the Harper's Bazaar Icons event in NYC Wednesday night. Looking stunning in a sexy white dress, Kendall put her slim figure on display. If you take a closer look at her boob, however, you'll notice the nipple ring poking through her gown!

The 19-year-old supermodel first teased fans with the idea of the racy piercing when she wore a relatively sheer black dress to ESPN's ESPY Awards earlier this summer. Flashes from the camera illuminated what looked to be a metal bar with two balls on each end going through her nipple. Eek! That had to have been painful.

Kendall Jenner, NYFW

Dimitrios Kambouris/WireImage

Kendall and Kylie are all about matching permanent accessories with other people as of late. Hailey Baldwin and Kendall chose to get inked with matching broken heart tattoos on their fingers at the beginning of August. At the time, a source told E! News, "They always wanted to get this."

As for whether or not they're growing up to fast, mama Kris Jenner says they're doing just fine, especially Kylie, who often gets criticized for her very grown-up appearance despite only being 18.

"Kylie is such a well-grounded person," Kris shared with E! News over the summer. "I think people don't give her enough credit for that. She's so smart, she's so loving, she's got the best heart.

"I was that way when I was 17," Kris explained at the re-opening of Williams-Sonoma at The Commons in Calabasas, Calif. "I thought I could, you know, do anything, and I was out on my own actually because I begged my mom to let me move in with my girlfriend. I thought I was so grownup."

New episodes of Keeping Up With the Kardashians return Sept. 27 at 9PM, only on E!