The 52-year-old actress posted a collection of sweet photos of herself with Dylan over the years, including one with the pair of them just hours after he was born.
The actress, who shares her son with husband Michael Douglas, 77, also shared an image of Dylan dressed in his robes posing proudly at his graduation from uni.
The Oscar-winner, who also shares daughter Carys, 19, with Douglas, gushed in the caption: ‘Happy 22nd Birthday Dylan. Zero to 22! You are everything to me and everything is you.
‘The joy you have brought to this world thus far, is immeasurable. I love you more than words can say.’
Fans were quick to share their well-wishes in the comment section, one wrote: ‘Gorgeous pic! Happy birthday Dylan.’
Another said they ‘can’t believe he’s a grown man. You’ve done a fab job with raising him!’ while a third added: ‘I like that he’s stayed out off the limelight unlike other celeb kids. A uni grad and doing well. Happy Birthday.’
A fourth shared: ‘Y’all raised a gentlemen (sic).’
The Oceans 12 actress recently shared how proud she was of Dylan graduating in May.
At the time, she posted a different photo of herself smiling as she stood beside him.
‘Graduation congratulations to my boy, my pride, my joy, Dylan,’ she wrote: ‘I am inexplicably proud of you and I love you beyond words.’
Dylan graduated with a degree in Political Science from the prestigious Brown University.
The Ivy League university was also attended by Harry Potter actress Emma Watson and American entrepreneur Ted Turner.
Dylan is currently on a luxurious yacht holiday with sister Carys, who recently graduated from high-school.
The teenager took to Instagram last week offer her 171,000 followers a glimpse into her ‘summer so far’ as she posed alongside her brother as they cruised the ocean in multi-million pound boat.
Last year, their famous dad appeared on The Kelly Clarkson Show where he revealed he had attended Carys’ graduation and was mistaken for her grandfather.
The Walls Street actor said the graduation was ‘lovely’, adding: ‘It was so wonderful, I’m so proud of her.
‘I gotta tell you Kelly, it’s a little rough when you’re going out the doors and the other parents are saying, “Oh congratulations… you must be so proud of your granddaughter.”’
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