Catherine Zeta-Jones shares son's photo on his birthday

Actress Catherine Zeta-Jones, who prefers to stay out of spotlight and social media, has shared a picture of her son, Dylan, on his 16th birthday.

The 46-year-old "Chicago" star expressed her happiness while posting an old snap of her son on Instagram.

"My 'beautiful boy' is 16 today. I can't believe how blessed I am to be able to call you my son. I love you," the actress wrote.

Dylan is seen playing a guitar in the picture.

Jones is also a mother of one daughter, Carys Zeta Douglas, 13, with her husband Michael Douglas. However, Dylan is their first child.