Celebrity Khloé and Kourtney Kardashian Show Off Their Super Toned Tummies in Latest Gym Selfie By Meredith Lepore Meredith Lepore Meredith Lepore is a writer and editor based in New York who covers all things fashion, celebrity, and pop culture. Her work has been published in The Observer, Travel + Leisure, Refinery29, Bustle, InStyle, Marie Claire, Self, Women's Health, and Cosmopolitan. InStyle's editorial guidelines Updated on January 18, 2016 @ 10:00AM Pin Share Tweet Email Photo: Chris Weeks/Getty Images Well it may have been an extra long holiday weekend for many of us, but for Khloé and Kourtney Kardashian, it was a chance to work out more. The two sisters posted almost identical workout pics of themselves side by side in a private gym wearing black leggings and tops that showed off their perfectly toned abs. Khloé shared her photo on Instagram with the caption, "Gym selfie with the MILF." Kourtney's pic was almost the same except she stuck her tongue out while Khloé remained in perfect selfie mode. Kourtney captioned it, "Double gym selfie." But going to the gym over the weekend is nothing new for either sister, as both reality stars have recently made a push to get in better shape. The Kocktails with Khloé host has lost 40 pounds in the past year, thanks to a strict routine of diet and exercise. And since having her third baby, Kourtney has also become a bit of a gym rat. Khloé Kardashian Gets Real About Exercising in New Khlo-Fit Video It was also a big weekend for Khloé as she surpassed 40 million Instagram followers. In a celebratory photo, she wrote, "40 Million Followers COME THROUGH!!!!! Cheers my loves! Cheers to your happiness and dancing in the rain!!!" Those gym selfies really paid off, Khloé!