He's not so little anymore! Jennifer Garner and Ben Affleck's youngest child and only son, Samuel Affleck, looks all grown up in new pics of the six-year-old spending the fourth of July holiday with his famous mom.

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Jennifer and Samuel.

In the sweet snapshots, Samuel and Jen can be seen taking selfies while sitting atop a fire truck in LA. The mother-son duo were appropriately festive for Independence Day dressed in matching red, white, and blue striped shirts. Jennifer accessorized her look with a wide-brimmed black sun hat and matching sunglasses.

Jen, 46, and her ex-husband, Ben, 45, welcomed Samuel in 2012. The couple — who separated after 10 years of marriage in June 2015 — are also parents to two older daughters, Violet Affleck, 12, and Seraphina Affleck, 9.

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Violet, Ben, and Seraphina.

In a previous interview, Ben revealed that Samuel actually had an unexpected playdate with royal tots Prince George and Princess Charlotte in London several years ago. Yes, you read that right! "It rains a lot in London… so they have those indoor play parks. So I took my son to one of those… and I get in there and I get this weird, stiff vibe and there's all these guys in there [wearing] suits. [So I think], 'Oh, it's dad's day at the Gymboree!'" Ben said during a past Live with Kelly and Ryan appearance.

"It turned out they were security guards and the kids who were playing in there were the royal kids," he continued. "So I can tell my son [one day] he played kickball with the King of England!" So cute!

Scroll down to read more about Ben and Jen's family!