Naomi Watts was every inch the proud mother on Saturday when she shared a sweet birthday tribute to her 18-year-old son Sasha.
The actress, 56, uploaded a reel of photos to Instagram as she lavished praise on her eldest child, who she shares with ex-partner Liev Schreiber.
‘Happy birthday sweet, darling @sashapeteschreiber 18 today and ready for the world!’ she penned.
‘Cannot believe it. Have so loved watching you grow into the kindest, most wonderful young man. Thank you for making me a first-time mum.’
The first image showed a recent close-up of Sasha, with Naomi also posting a photo of the pair standing side by side as they wore sunglasses.
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Naomi Watts was every inch the proud mother on Saturday when she shared a sweet birthday tribute to her 18-year-old son Sasha (pictured)

The actress, 56, uploaded a reel of photos to Instagram as she lavished praise on her eldest child, who she shares with ex-partner Liev Schreiber. Pictured when Sasha was a baby
The King Kong star then shared a throwback image from when Sasha was just a baby in the late 2000s.
Naomi cradled a young Sasha on her hip as she smiled at the camera.
The final photo seemed to have been taken before a formal event, as Naomi adjusted a boutonnière on the black suit Sasha was wearing.
It comes after Naomi reunited with her ex-husband Liev, 57, to celebrate their son’s high school graduation in Central Park, New York last month.
The actress—who split from Liev in 2016—was joined by her husband, Billy Crudup, while Liev attended with his wife, Taylor Neisen.
The proud dad also shared a sweet snap from the special occasion, as he posed with the graduate and family members.
One photo showed Sasha looking dapper in a grey suit as he stood between his parents and their partners.
‘The graduate!’ Liev, who also shares 20-month-old daughter Hazel with Taylor, captioned the post.

‘Happy birthday sweet, darling @sashapeteschreiber 18 today and ready for the world!’ she penned

The final photo in the post seemed to have been taken before a formal event, as Naomi adjusted a boutonnière on the black suit Sasha was wearing
They were also joined by their second child, daughter Kai Schreiber, 16, after Liev recently talked about his reaction to Kai coming out as transgender.
Liev’s graduation post received a number of comments from his famous pals, including Halo star Pablo Schreiber, who left three clapping hand emojis.
Another comment addressed Liev’s old-school camera: ‘The camera around the neck is pure Dad mode! Mazel Tov!’
‘Dad camera game on point! Congratulations!’ said another.
Naomi also shared a photo featuring just Liev, Sasha and herself as they embraced the newly minted graduate.
‘Congrats!’ she wrote over the snap.
The family were spotted walking through Central Park together, with Liev chatting to Billy while Naomi spoke with Taylor.