Reality television stars and siblings Kim Kardashian and Kendall Jenner took a moment to strike a pose during a recent workout at the gym, according to People Magazine.

Jenner, 18, posted the portrait of her and her sister, Kardashian, 33, to Instagram on Jan. 10. In the image, the two wear matching exercise wear, while Kardashian’s face is obstructed by the camera’s flash. Jenner captioned the image, “[B]arging in on Kim’s booty selfie.”

Kardashian recently came under fire for a different selfie posted to Instagram on Jan. 4. In the image, Kardashian strikes a similar pose showing off her rear, this time with friend Blac Chyna. Many who saw the image claimed it had been digitally altered to make her appear thinner.

The reality star has denied the claims.

Kardashian states that her recent weight loss is the result of hard work in the gym. The new mother faced harsh criticism over weight gain that occurred during her recent pregnancy. She gave birth to daughter North, with fiancé rapper Kanye West, in June.

“It sucks when people make up surgery or photoshop lies when I am so disciplined,” she said in a tweet on Jan. 10.