July 25, 2016 08:30 PM

Naomi Watts is celebrating her son.

The mother of two took to Instagram on Monday, wishing her elder son Alexander Pete — whom she calls Sasha — a happy birthday.

“Happy birthday to our first little miracle. Sweet Sasha is adventurous, loving and kind. A powerful beam of light in our family. Feel so blessed to watch him grow,” Watts, 47, captioned a photo of the two.

In the snap, the British-born Australian actress and her son cuddle, as he rocks a crown and gold necklaces that say happy birthday.

Naomi Watts/Instagram

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The 9-year-old is Watts’ first child with longtime partner Liev Schreiber. They’re also parents to 7-year-old Samuel Kai.

RELATED VIDEO: Liev Schreiber Does Something Called ‘The Willy Dance’!?

The pair welcomed Alexander in 2007 after two years of dating, and named him Alexander in honor of Schreiber’s grandfather, choosing the middle name Pete as a nod to Watts’ father.

“It’s total euphoria. I love being a mum,” Watts said about motherhood in 2008. “I always knew I would. All the clichés are true. I spend my days making a number of bizarre noises and bizarre faces.”

Naja Rayne 

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