Kate Hudson Shares Throwback Photos as She Celebrates Son Ryder's 21st Birthday with Heartfelt Tribute: 'Love You So'

Kate Hudson's son is officially 21!

On Tuesday, Jan. 7, the actress, 45, shared a Reel on her Instagram full of throwback photos of her son Ryder as she celebrated his 21st birthday. In the post, Ryder could be seen cuddling with his mom, making funny faces and spending time on vacations with his family.

"Oh my baby Ryder ⭐️21 today⭐️ My cozy, hilarious, smart, dedicated, loving son. As a mama you wonder what this day will feel like and I have to say it is nothing as I expected. It’s better," Hudson wrote in her caption.

"Every milestone on this journey to adulthood has been a joy and every year as wonderful as the next. I love you so!!! 🥳Happy Birthday🥳."

Ryder commented on his mom's post, saying, "Love you Ma ❤️ ❤️ ❤️."

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Related: Kate Hudson Prepares for Her ‘Favorite Time of Year’ amid Christmas Tree Outing with Daughter Rani, 6

Alongside Ryder, Hudson is mom to daughter Rani, 6, whom she shares with fiancé Danny Fujikawa, and son Bingham, 13, whom she shares with ex Matt Bellamy.

Speaking with PEOPLE for a June cover story, the Glass Onion: A Knives Out Mystery actress opened up about her relationship with her son Ryder. Noting that now that her son is older the two have a real friendship, Hudson said she will always be his mom.

"But because I guess I was young when I had him, it's a different relationship than with my other kids. So he's seen me through all of my good times, my bad times, this boyfriend, not that boyfriend," Hudson said.

"He's seen me through it all. And that's very different because I never had an adult life really without him," she noted of Ryder. "So it's a little, I think more protective, meaning I think he's very protective of me. And then I think my other kids will be, because we've been through so much together."

"I mean, he really was my partner in crime, and I never went anywhere without him," the mom of three told PEOPLE. "So it's very, very close. And I think, yeah, he does get protective."

Elsewhere in the interview, Hudson spoke about her "patchwork family," noting that all of her kids are very close.

“We are very connected, and we are very close,” Hudson shared. “Love can change form. It’s interesting when you have that modern family; there’s so much love for all the kids.”

“I think the thing that's so unique about my life is that in this very patchwork family, we all have figured it out … The kids feel like they have this huge family,” continued Hudson, who added that her exes' daughters and Rani “are like sisters … There is something that has been able to be nurtured in our family that is personally what I think is, it's very rare.”

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