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Austin Swift and recording artist Taylor Swift attend the 49th Annual Academy of Country Music Awards.

Taylor Swift wished her younger brother, Austin Swift, a happy birthday on Friday, March 11, with the most adorable flashback photo of the siblings as young children.

“Happy birthday Austin!!!!!” the “Out of the Woods” singer, 26, captioned the picture on Instagram. “Thanks for 24 years of LOLs.”

In the vintage snap, the pop superstar — dressed in a colorful fruit-and-vegetable-print dress, her blonde curls framing her cute face — is laughing happily next to her equally blond T-shirt and khaki-clad little bro.

The Grammy winner hasn’t been shy about showing off their strong bond. Austin has appeared at quite a few red-carpet events with his big sister, and she’s also shared photos on social media of them spending quality time together. (Remember that snowman they built with her boyfriend, Calvin Harris, over the holidays?)

The songstress has also boasted about Austin, who is an aspiring actor. She bragged on Instagram last September that her handsome sibling had just acted in his first film, I.T.

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The movie — which stars Pierce Brosnan — is due out later this year, so between his big sister’s ridiculously charming birthday wish and the upcoming premiere of his first film, we’d say his 24th year is off to a pretty good start! Happy birthday, Austin!

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