Landon Barker is celebrating a milestone birthday!

On Wednesday, Oct. 9, Travis Barker posted a heartfelt Instagram tribute to his eldest son for his 21st birthday.

The 48-year-old drummer posted a carousel with several photos of the “Friends with Your Ex” singer throughout the years, beginning with an adorable pic of young Landon and Travis.

The post continued with more photos of a younger Landon showing off his personality, from singing into a microphone in a recording studio and making silly faces in restaurants to posing with a couple of toy guns outside of a tour bus.

Other photos included Landon in more recent years, such as a photo with Travis and his wife, Kourtney Kardashian Barker, at their gender reveal party. At the time, Thet Kardashians star, 45, was pregnant with baby Rocky Thirteen, who is now 11 months.

He closed the carousel with a photo of Landon playing guitar as Travis played the drums on stage. Travis also wrote a kind message with the caption: “Happy Birthday, @landonasherbarker. You blessed my world 21 years ago, and I am forever grateful.”

“So proud of the man you’ve become and everything you’ve set out to accomplish and did. You are the best son and brother anyone could ask for,” he continued. “I love you always and forever my boy and cherish every moment with you. 🖤.”

Landon sweetly replied in the comment section: “I love you! ❤️.”

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Along with his post, Travis added a few Instagram Stories with even more adorable pictures of Landon as a child. Throughout the Stories, he reiterated how much he loves his son, writing: “I love you to the moon and back,” and “Best father/son duo no question.”

Kourtney also celebrated Landon’s birthday in her Instagram Stories. Along with reposting Travis’ pics, she shared snaps of the family’s celebrations. In the first slide, she posted a video of Landon’s birthday cupcakes, and wrote: “21 !!! Happpppyy birthday @landonasherbarker ❤️. grateful for you. More Landon moments forever. Love you!”

She also added a photo of the decorations around the house for his birthday, including balloon arches that read: “Happy Birthday Landon.”

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Travis shares Landon, daughter Alabama, 18, and his stepdaughter Atiana, 25, with his ex-wife Shanna Moakler. He also shares baby son, Rocky, with Kourtney.

Kourtney shares Mason Dash, 14, Penelope Scotland, 12, and Reign Aston, 9, with her ex-boyfriend Scott Disick.