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.

WATCH: Britney Spears' Niece Maddie Returns to Basketball Practice Following Terrifying ATV Accident

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: