Liev Schreiber and Naomi Watts' Son Sasha Looks All Grown Up as They Celebrate His 17th Birthday

The actor welcomed his son in 2007 with ex-wife Naomi Watts

Dimitrios Kambouris/Getty; Naomi Watts/Instagram; Dimitrios Kambouris/Getty

Liev Schreiber, son Sasha, Naomi Watts' title='Liev Schreiber attends the The 77th Annual Tony Awards at David H. Koch Theater at Lincoln Center on June 16, 2024 in New York City.; Naomi Watts wishes son Sasha a happy birthday in Instagram post; Naomi Watts attends the 2023 CFDA Fashion Awards at American Museum of Natural History on November 06, 2023 in New York City'>

Dimitrios Kambouris/Getty; Naomi Watts/Instagram; Dimitrios Kambouris/Getty

Liev Schreiber, son Sasha, Naomi Watts

Liev Schreiber and Naomi Watts are celebrating their son Sasha as he rings in his 17th year.

On Thursday, July 25, the actor, 56, posted on Instagram in honor of his son Sasha turning 17. The film producer shares Sasha, as well as daughter Kai, 15, with his ex-wife Naomi Watts, 55.

"Happy Birthday Handsome!" the proud dad captioned a photo of the father-son duo posing together in front of a step and repeat.

Watts, who split from Schreiber in 2016, also shared a sweet birthday tribute for Sasha on her own Instagram. The actress posted two shots of the mother-son duo from her second wedding to husband Billy Crudup in June.

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Related: Naomi Watts' 2 Children: All About Sasha and Kai

"Happy Birthday to my darling Sasha- you have a heart of gold. I'm so very proud of you," the mom of two wrote in her caption. "17 years ago you shot into the world with your arms reaching for the sky. You are a force but with the most gentle soul."

She continued to show her gratitude, writing, "I thank my lucky stars that you chose me to be your mum. And I'm so very grateful to have you by my side here. I love you. Keep reaching for the stars. ✨💛."

Schreiber is also a dad to daughter Hazel, 10 months, whom he welcomed with his wife Taylor Neisen, 31, in 2023. Sasha recently shared that he's "bummed" to be missing out on spending quality time with his baby sister while he's away at school.

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Naomi Watts Instagram

Naomi Watts and son Sasha' title='Naomi Watts and her son Sasha Schreiber'>

Naomi Watts Instagram

Naomi Watts and son Sasha

While appearing on Live with Kelly and Mark on Monday, April 15, the dad of three shared, "They're amazing. Sasha and Kai, you know them. They love her. It's been really great."

"I just talked to Sasha, who's up at this terrific school in Vermont called The Mountain School, where he's taking care of animals, and he just said that he's bummed out because he's missing being with her," he told Kelly Ripa and Mark Consuelos of his kids.

"And it's just, so sweet. My god. Such a sweetheart. And he did this little film for his class that he just sent me last night which was a short film. He made an adaptation of Doris Lessing's Through the Tunnel, which is basically about a kid who doesn't want to grow up because he loves being a kid so much."

"You know when your kids do things like that that just...you know, because they're such monsters 99% of the time. And then they do something so profoundly sweet and you're just like, 'Wow,' " the star joked.

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