Chris Pratt just hit a new parenting milestone - his eldest son is officially a teenager.

On Sunday, August, 17, the actor took to his Instagram Stories to mark Jack's 13th birthday with a collage of rare snapshots of the two together. "I have a teenager???" Pratt wrote on top of the photos. The collection featured the duo wearing matching "Pratt" jerseys, working on projects, visiting farms, and cheering at sports games.

He continued, " Jack, I can't believe you are 13 today. I've watched you grow into such an incredible young man, and am truly proud of the person you are becoming. I love you! Jesus is King."

The collection of images featured father-and-son moments from over the years, including the duo wearing matching "Pratt" jerseys, working on projects, visiting farms, and che

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