Reese Witherspoon's son Deacon looks all grown-up in adorable 12th birthday photo

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They grow up so fast!

Reese Witherspoon celebrated her son Deacon's 12th birthday on Saturday, and the adorable tween is starting to look more and more like his mom every time we see him. The Hot Pursuit star shared an Instagram snap alongside her oldest son, Deacon Phillippe, who was all dressed up for the big day. The birthday boy looked dapper dressed in a suit and bow tie -- with a cupcake in hand, of course! -- while Witherspoon wore a white dress with pink and purple flowers.

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"Happy birthday to my sweet 12-year-old boy!" the 39-year-old actress captioned the photo. "You bring joy to everyone you know. I feel so blessed to be your mom."

The mother of three also shared a picture of a bright green cake, which she said was "the only cake for a golf loving kid."

The only cake for a golf loving kid. 🎂💚#golfer #12 #birthdaycake

A photo posted by Reese Witherspoon (@reesewitherspoon) on

Witherspoon's daughter, Eva Phillipe, got in on the birthday wishes as well, posting a throwback photo with her brother.

"Happy birthday to my imaginative and kind little brother and friend since '03. Love you so much, buddy," the 16-year-old big sis wrote.

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Witherspoon shares Eva and Deacon with her ex-husband, Ryan Phillipe. She also has a 3-year-old son with husband Jim Toth.

All three of the actress' adorable kids look just like their mama!

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