Dwayne Johnson Shares Heartfelt Message and Flashback Photo for Daughter Simone on Her 'Sweet 16'

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The 45-year-old actor opens up about his father-daughter bond.

Dwayne Johnson can't believe his daughter, Simone, is growing up so fast.

On Monday, the 45-year-old actor celebrated Simone's 16th birthday with a super sweet post on Instagram. "And just like that my baby girl @simonegjohnson turns 16," he captioned a flashback photo of when his daughter was still a little girl. "Feels like just yesterday, I held her tiny body in my hands the day she was born as I whispered, 'I'm gonna love and take care of you for the rest of my life.' She of course cried, which in newborn lingo translates to, 'You're the best damn daddy on the planet.' True story."

WATCH: Dwayne Johnson Shows Off His Muscles During Daddy-Daughter Time Before the Oscars

Continuing to gush over his daughter, Johnson added: "Happy Birthday, honey! I'm so proud of the awesome young woman you've become. Keep your eyes on that prize, keep working hard and I got your back every step of the way. Now go have fun!
#FatherDaughterBond #OurSnapPhilosophy"

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The action star loves to pull out all the stops when it comes to birthdays. When his youngest daughter, Jasmine, turned a year old in December, Johnson shared a video of him singing "Happy Birthday," which inevitably made hearts melt.

WATCH: Dwayne Johnson Goes on Adorable Father-Daughter Date With Eldest Child Simone at People's Choice Awards

Then on his birthday in May, he also posted a snap of himself and Jasmine hanging out. "This lil' mama surprised me by runnin' into my arms and yelling, 'Daaaahdeeeeee,' which in my mind clearly means, 'Happy birthday, daddy! You're the coolest daddy on the planet and the sexiest man alive. Now go crush your workout and keep stayin' woke,'" he quipped in the caption.

Check out the adorable father-daughter moment: