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Khloe Kardashian, Kourtney Kardashian, Gym

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These Kardashian sisters are twinning!

Khloe Kardashian, 31, and Kourtney Kardashian, 36, show off toned tummies in almost matching outfits—black crop tops and matching leggings—at a gym in sassy mirror selfies posted on their Instagram pages on Saturday. 

"Gym selfie with the MILF," Khloe wrote.

"Double gym selfie," said Kourtney, mother of Mason Disick, 6, Penelope Disick, 3, and Reign Disick, 1, wrote alongside another pic, showing her sticking out her tongue.

Khloe began to work out regularly with a personal trainer almost a year ago and has since dropped about 40 pounds, People magazine reported last week. She lost 35 pounds just this past summer.

Khloe Kardashian, Kourtney Kardashian, Gym

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"Looking back now I realized I was unhealthy but I wasn't…I think we all know what fat is, I don't think I was fat, I think I was unhealthy," Khloe told E! News in November. "

Kourtney had also embarked on a diet and fitness regimen to lose the baby weight she gained while pregnant with son Reign.

 

Watch Keeping Up With the Kardashians on Sunday at 9 p.m. ET on E!