Naomi Watts wishes her youngest child Kai a happy 15th birthday: ‘You are everything to me’

Naomi Watts shared a heartfelt tribute to her youngest child Kai on Wednesday to mark his 15th birthday.

The Mulholland Drive actress, 54, posted a photo of the teenager enjoying a walk on the beach and captioned it with some sweet words.

“Happy birthday, my sweet angel. You are all for me. I’m so lucky to be your mom,” she began.

“Keep dancing and showing the world your dynamic and glorious spirit.”

Many of Naomi’s celebrity friends were quick to send her birthday wishes.

Naomi Watts (left), 54, shared a heartfelt tribute to her youngest child Kai (right) on Wednesday to mark their 15th anniversary.

Naomi Watts (left), 54, shared a heartfelt tribute to her youngest child Kai (right) on Wednesday to mark their 15th anniversary.

“Happy birthday beautiful Kai,” wrote Hollywood star Julianne Moore, while Australian model Alison Daddo added: “Happiest day for your loved one.”

Naomi shares her 16-year-old children Kai and Sasha with her ex-partner Liev Schreiber.

Naomi tied the knot with her partner Billy Crudup, 55, at a New York City courthouse in June.

The Mulholland Drive actress posted this photo of the teenager enjoying a walk on the beach and captioned it with sweet words.  “Happy birthday, my sweet angel.  You are all for me.  I’m so lucky to be your mom,” she began.

The Mulholland Drive actress posted this photo of the teenager enjoying a walk on the beach and captioned it with sweet words. “Happy birthday, my sweet angel. You are all for me. I’m so lucky to be your mom,” she began.

Naomi shared the news of her marriage with her followers when she took to Instagram, posting a photo of herself and her new husband as she posed on the steps of a Manhattan courthouse shortly after tying the knot.

The British-Australian actress stunned in a $7,400 white guipure Oscar de la Renta Sweetheart Water Lilly dress and captioned the post: “Clutched.”

Naomi first sparked rumors that she and Billy were engaged earlier this year when she unveiled a huge marquise-cut diamond and diamond-encrusted ring.

Many of Naomi's famous friends were quick to send birthday wishes.

Many of Naomi’s famous friends were quick to send birthday wishes.

The star, however, refused to confirm the engagement rumors, even after American Today show host Hoda Kotb directly mentioned it during a late April appearance on the morning talk show.

Near the end of her performance, Naomi Hoda joked that her “eye was hurting” due to “a lot of shine coming from some ring here.”

Naomi and Billy met on the set of the 2017 Netflix series Gypsy, in which she played the role of a therapist who uses a pseudonym to develop close (and unethical) relationships with people closely related to her patients, and Crudup played her husband.

The colleagues’ relationship began later, in 2017, a year after Naomi broke up with her partner of 11 years, actor Liev Schreiber.

Naomi shares her 16-year-old children Kai and Sasha with her ex-partner Liev Schreiber.  Everything is in the photo

Naomi shares her 16-year-old children Kai and Sasha with her ex-partner Liev Schreiber. Everything is in the photo