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Time flies when your kids are growing up. Just ask Reese Witherspoon

The Big Little Lies star shared a photo of herself posing with her now 15-year-old son Deacon Phillippe in honor of his birthday and asked the question all moms will ask in their lifetime: “When did you get so tall?”

In the photo, Deacon stands almost a head taller than his mom. Witherspoon captioned the photo, “Happy Birthday to my wonderful, kind, talented boy Deacon Phillippe! Everyday you teach me something new about beats, Fort Nite dances, fantasy football and cool sneakers. What a gift to be your mom. I love you, Buddy! (P.S. When did you get so tall?) #thisis15.”

Thank goodness for teenage boys and their innate understanding of what’s “cool.”  

Happy birthday little big guy.

RELATED: Reese Witherspoon & Jim Toth Just Won Parents of the Year with Their Dedication to Mystery Reader

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