Kate Hudsonhas a few sweet words for her teenage son on his 16th birthday.

The 40-year-old actress celebratedRyder Russell‘s big milestone with a sweet tribute postshared on her InstagramTuesday. Alongside a throwback home video of her son on his second birthday, Hudson also penned a heartwarming message to her eldest child.

“I didn’t realize it would be here so fast!” she began. “16 years today. 16. I will savor these next couple years before he flies the nest.”

“People sometimes get sad on days like this. Time creeps up on us and rocks us a bit, reminding us that the years don’t wait for us to be ready. Well, RYDER IF YOUR READING! I’M READY!!!” she continued.

Hudson went on to gush about Ryder’s growth and her excitement for the teen’s bright future.

“I’m excited for your future. An amazing young man you are,” she wrote. “I am honored that you chose me to be your mother.”

“Look at the birthday boy! How’s 16 treating you?” she asked.

To which he jokingly replied, “It was great until you started filming me.”

Ryder Robinson.Kate Hudson/Instagram

Kate Hudson

Hudson was married to Ryder’s father, The Black Crowes frontmanChris Robinson, from 2000 to 2007. When they divorced, the couple agreed to share custody of their child.

Hudson opened up about what it was like raising Ryder in 2016,telling PEOPLEat the time that her son is “a great kid.”

“It’s a beautiful time,” she said of his preteen years. “I feel like seeing him now is the most amazing thing because you’re really starting to understand and see their character as they get to this age.”

TheHow to Lose a Guy in 10 Daysstar also spoke about Ryder in December, revealing onThe Rachael Ray Showthat her oldest child “doesn’t care” about getting his driver’s license despite being of legal age to apply for a learner’s permit.

Kate Hudson and son Ryder.John Salangsang/WWD/REX/Shutterstock

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“The second I was 15, I was like, ‘Give me my permit!’ ” Hudson recalled. “Ryder’s kinda like, ‘I got basketball practice, I can’t really do the permit thing right [now].’ ”

In addition to Ryder, Hudson is mother to son Bingham “Bing” Hawn, 8, with ex-partnerMatt Bellamy. The duo announced that they hadcalled off their engagementin December 2014 after four years together.

The Golden Globe winner welcomed her third child,daughter Rani Rose, in October 2018 with boyfriendDanny Fujikawa.

source: people.com