Reese Witherspoon and Ryan Phillippe celebrate son's 18th birthday: 'My heart is bursting with pride'

Reese Witherspoon and Ryan Phillippe
Photo credit Evan Agostini/Getty Images

Deacon Phillippe can legally vote.

Reese Witherspoon and Ryan Phillippe spent the weekend crafting heartfelt Instagram posts to celebrate their son's 18th birthday.

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Phillippe posted a sweet photo of the three of them gathered around a birthday cake with the caption: "Happy 18th birthday to our gorgeous, smart, talented, and caring son. You are a true light in this world and are so loved by all who know you. We are lucky to be your mom and dad. Love you, pup..(I'd say we did pretty good @reesewitherspoon)."

Deacon commented, "Thanks dad!! I love you."

The "Legally Blonde" actress weighed in, writing, “So proud of our boy ... I mean our ADULT Son!”

Witherspoon also posted a tribute consisting of several throwback photos of the birthday boy.

“How did this happen?!! @deaconphillippe is 18?!!One day he was trading Pokémon cards, singing Bruno Mars songs, and playing American Ninja Warrior in the backyard. The next day, he is taller than me, cooking the family steaks on the grill and making his own music with his best friends. My heart is bursting with pride about the young man he is becoming. Happy 18th Birthday Deacon! I love you to the moon around the sun and all the stars," she captioned the carousel of photos.

Deacon shouted out his mom in the comments, writing: “Love you mom!!”

Phillippe and Witherspoon, who split in 2006 after seven years of marriage, also share daughter Ava Phillippe, 22. Witherspoon also has a son, Tennessee James, 9, with husband Jim Toth. The couple tied the knot in 2011.

Recently, Witherspoon talked with Interview magazine about the fact that she now has older children with which to share things deeper than, say, Pokémon cards.

“I never expected the kind of relationship that I have with them,” said “The Morning Show” star, adding, “but it's so rewarding to be able to have kids that you can process life with a little bit, and they help me understand the complexities of what it means to be a human now. So I'm really, really grateful that these little humans are in my life. Adult humans.”

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