Celebrity Kourtney Kardashian-Barker Kourtney Kardashian Confirmed She's Ageless in Throwback Lingerie Photo from 1999 Not much has changed in two decades. By Alicia Brunker Alicia Brunker Instagram Alicia Brunker is a freelance writer who covers celebrity, royal, and fashion news for InStyle.com. She joined InStyle's digital team in 2017, and previously contributed to ELLE, T: The New York Times Style Magazine, and WWD. InStyle's editorial guidelines Published on April 10, 2021 @ 12:20PM Pin Share Tweet Email In more than 20 years, not much has changed for Kourtney Kardashian. Before she and her sisters became synonymous with lingerie-clad selfies, Kourt was already posing in her bra and underwear in front of the camera. Need proof? Look no further than her latest Instagram post. "90s vibes only! (1999 to be exact!)," the eldest Kardashian sibling wrote alongside two throwback photos of her 20-year-old self in a black lacy bra and matching boy shorts. She wore her hair in a high ponytail with double face-framing tendrils pulled behind her ears — a signature style of the decade. Aside from the frosted lips and jazz hands (remember those?), the snapshots could've passed as present day. In fact, Kourtney did manage to fool some of her followers into thinking the photos were taken recently. "I can't tell if this is now or from 1999 either way you look the same," wrote actress Lauren Perez. Another user chimed in with a similar sentiment, adding: "You literally do not age 🥺🥺🥺." Kourtney Kardashian's Snow Outfit Consists of a Bikini and Cowboy Hat The photos were posted to Kourt's IG feed in promotion of Poosh's upcoming wellness festival. "Meet me at our second Poosh Your Wellness Virtual Festival on May 1st. General admission is FREE but you must RSVP," she continued in the caption. "Grab your PYW tickets now - poosh the link in bio for all the dope deets!" At the summit, Kim Kardashian will offer a plant-based cooking class, while Kendall Jenner and her 818 Tequila will host a virtual happy hour. No word yet if Kourtney plans to teach a masterclass on her secret to staying ageless, but our fingers are crossed.