The Goop founder marked his 17th birthday on Instagram with a sweet tribute and a rare photo of the two of them together.
“Happy 17th birthday to the boy that fills my soul up every time I look at him,” Gwyneth wrote in the post. “@mosesmartin you are the most exceptional, kind, loving human being.”
“You keep us all laughing with your perfect impressions and you inspire us with your harmonies," she continued. "I deeply adore you more than you could ever imagine! Love, mama.”
Gwyneth shares Moses with her ex-husband, Chris Martin, along with her daughter, Apple, 18. They were married for more than 10 years before splitting in 2014 in what Gwyneth famously called a "conscious uncoupling."
She has since remarried television writer Brad Falchuk, who's also a dad to two kids from a previous marriage.