Jessica Simpson shared a sweet picture of her son Ace on April 15. Credit: Courtesy Jessica Simpson/Instagram; Inset: Jason Merritt/Getty Images

This cutie won't quit! Jessica Simpson's Instagram account is essentially a shrine to her two precious kiddos, son Ace and daughter Maxwell. On Wednesday, April 15, the proud mom, 34, shared another sweet shot of her little man, 21 months. 

"'Oh! Darling' Lennon--McCartney," she captioned the picture of her blonde-haired baby, who was rocking sneakers and looking up at his mom from the asphalt. 

It seems Ace has a bit of sass in him, tossing a little side eye at the fashion designer. Simpson has been posting a lot of images of her tiny man lately. 

Playground Poser

A photo posted by Jessica Simpson (@jessicasimpson) on Apr 7, 2015 at 6:19pm PDT

A week ago she shared a pic of him going down a slide, and writing, "Playground Poser." 

"I'm excited to see Ace grow into his own person and watch his personality develop more each day," Simpson told shortly after welcoming her second child. "We see different parts of our family in each of them."