Kourtney Kardashian‘s latest post will have you doing a double take!

The Kardashians star posted a series of adorable selfies with 7-year-old son Disillusioned ReignShe shares her ex with. Scott DisickThey had a great time at the pool. In the Aug. 21 Instagram, Kourtney and Reign stuck several poses in the water, with each one making silly faces at the camera.

In fact, the mother-son duo looked identical—not just with their expressions but with their facial features.

“Happy Sunday!” “Happy Sunday!” was the caption of her message by Poosh founder. “Xo, Kourtney & Reign”

Fans expressed how heartwarming the candid snapshots were, with reality TV star Brittny Gastineau commenting on Kourtney and Reign’s similarities, writing, “Omg TWIN.”

Others pointed out how big Reign appeared to be in the photos.

“Reign is growing so much. It’s amazing to watch all of the Kardashian/Jenner children grow up.” One fan responded, adding that it was “cool” and another added, “oh my god, Reign is growing so fast.”