The actress, who is 56 years old, posted a slew of pictures on Instagram on Friday, July 25, to commemorate her son Sasha's 18th birth...
The actress, who is 56 years old, posted a slew of pictures on Instagram on Friday, July 25, to commemorate her son Sasha's 18th birthday.  The pleased mother shared images of her son smiling, posing in a garden with sunglasses on, and some old pictures of them together.
 "Happy birthday, sweetie! @sashapeteschreiber is 18 today and ready for the world!"  "I can't believe it," Watts wrote in her caption.
 "I have loved watching you grow into the most kind and wonderful young man."  Thanks for making me a mum for the first time. 
 Watts has a daughter named Kai, 16, with her ex-husband Liev Schreiber.
 Sasha shared a post from his sister Kai on his Instagram Stories. The post showed the two of them when they were younger.  "Happy birthday ," Kai wrote on the picture.
 Schreiber also shared a picture on Instagram to celebrate Sasha's birthday, saying, "Happy Birthday Handsome!"  I truly think you should think about taking that gap year to hang out with me in Southeast Asia again.
 Watts and Schreiber got back together in June to celebrate their son Sasha's high school graduation.  In one picture on Schreiber's Instagram, Watts was wearing a straw hat and a multicoloured maxi dress. She was standing close to her son Sasha and her husband Billy Crudup.
 Schreiber stood next to his kid on Sasha's opposite side, with a film camera around his neck and his wife, Taylor Neisen, next to him.  In the middle was Sasha, who was wearing a grey suit and brown shoes.
 "The graduate!!!"  Schreiber wrote in the caption.  Watts also posted a similar picture on her Instagram Stories, with a sticker that said, "Congrats!"
 Watts posted pictures and videos of her son Sasha all dressed up and ready to go to his high school prom on her Instagram Stories in May.  Watts and Schreiber took a selfie with their son in the midst. He was wearing a dark suit and a boutonniere.
 There were also images and videos of the adolescent with some of his friends at prom and a big picture of the whole class celebrating the big event.
