Britney Spears Masters 'Silly Faces' With Look-Alike Son Jayden -- See the Pics

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Britney Spears and her 10-year-old son, Jayden, are very good at goofing off!

The 35-year-old pop star posted some selfies to Instagram on Tuesday night of the mother-son duo making a series of animated expressions. "Mastering the art of silly faces," Britney captioned the photo montage.

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Mastering the art of silly faces 😁😜🤔

A post shared by Britney Spears (@britneyspears) on

Jayden is certainly looking more grown up with his braces, and the "Slumber Party" singer loves to share photos of her youngest son and his 11-year-old brother, Sean, on Instagram.

WATCH: Britney Spears' Sons Sean and Jayden Look All Grown Up in Matching Outfits

Last May, she penned a heartfelt open letter to her boys in Time, calling them her "masterpieces."

"I pray as a mother I teach you strength and passion to carry through the struggles in the world. Most battles will always be won on your knees. I pray you find your dreams," she wrote. "God always comes to us in tiny whispers. I pray you always find his whisper and understand the true meaning behind following your inner voice as well."

Check out the letter in its entirety: