Travis Barker Pays Tribute to 'Beautiful' Daughter Alabama on Her 18th Birthday: 'My Baby Is All Grown Up'

Travis Barker is celebrating his daughter Alabama's milestone birthday!

The Blink-182 drummer, 48, posted a touching tribute to Alabama as she turned 18 on Sunday. "Happy Birthday my beautiful daughter. I can’t believe my baby is 18 and all grown up," he wrote on Instagram, alongside a series of photos of Alabama from over the years.

"Being your Dad is the biggest joy in the world," he continued. "May you be surrounded by love and all your favorite things today and forever!"

Barker added: "I’m so proud of you and I love you so much @alabamaluellabarker ❤️."

Barker and Alabama — whom he shares with ex-wife Shanna Moakler — enjoy a close bond. Back in September, the teen shared a sweet note that her father wrote her on a Post-it note.

“You are my everything,” the note read, according to a screengrab of Alabama's Instagram Story post captured by E! News at the time.

The teen wrote her dad back in text over the image, “Your [sic] truly the best dad."

Barker also shares son Landon, 20, and stepdaughter Atiana De La Hoya, 24, with Moakler, and he and wife Kourtney Kardashian welcomed a son, Rocky Thirteen, on Nov. 1.

Alabama recently opened up about her health after she faced body-shaming comments stemming from some paparazzi photos. In a candid TikTok video in August, she revealed that she has an autoimmune disease and a thyroid issue that resulted in weight gain.

“Paparazzi will purposely take pictures of you with your mouth open, middle of a sentence and any ugly picture they can get of you just for views,” she said in the clip as she clapped back at the criticism.

“I would love to see you guys getting random pictures of you taken of you when you’re leaving the grocery store, in the middle of a sentence, with your mouth wide open… and let’s see how beautiful you look," she continued.

Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from celebrity news to compelling human interest stories.

After explaining the health conditions that contributed to her weight gain, Alabama said, “So, it would be very appreciated if you guys just keep your opinions to yourself."

She also expressed her hope that any young girls watching her video don't ever “think there’s something wrong" with "gaining weight" or experiencing weight fluctuations.

“There is a certain point where if your health is getting affected by it, that you need to change it, but no… That’s not the case for me and I would appreciate it if you guys put yourself in my shoes,” she added.