Taylor Swift Wishes Brother Austin Happy 24th Birthday With Adorable Throwback Pic

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The singer shared a totally cute sibling pic on Friday.

Taylor Swift is the queen of the throwback pics, so her brother Austin probably should have seen this coming.

WATCH: How Taylor Swift's Brother Keeps Her Humble -- See the Adorable Pic!

The singer posted an adorable pic for her little bro’s 24th birthday on Friday, showing off the Swift siblings in all their ‘90s glory, tossing their heads back in laughter during a photo shoot.

“HAPPY BIRTHDAY AUSTIN!!!!!” Taylor captioned the pic. “Thanks for 24 years of LOLs. @austinkingsleyswift.”

WATCH: Taylor Swift's Brother Austin Looks Dashing at 'Star Wars' Premiere

The singer has never been shy about showing her support for her little brother, who recently made his acting debut in revenge thriller I.T.

“My brother @austinkingsleyswift just acted in his first movie and I'm all proud and stuff,” Taylor posted to Instagram in September.

WATCH: Taylor Swift Proudly Posts Pic of Brother Austin's Acting Debut

Austin, for his part, supports his big sis as well, keeping her humble, as well as standing up for her when Kanye West calls her out. See how he responded when the rapper dropped “Famous” in the video below.

WATCH: Taylor Swift's Brother Throws Out His Yeezy Sneakers After Kanye Calls Her Out in New Rap