"Thanks for 24 years of LOLs," the big sister wrote on Instagram.
The 1989 hitmaker wished her brother Austin a happy 24th birthday with the most adorable throwback photo of the Swift siblings.
Along with her caption, Taylor shared a snap of the pair LOL-ing for a cute brother-sister portrait. The 10-time Grammy winner sported a colorful print dress along with natural blonde curls while little Austin wore a blue collared shirt and khakis.
Over the years, the University of Notre Dame alum has been very supportive of his famous big sister.
Also, Austin is a great red carpet date. He’s joined his pop star sister on many award shows and A-list events most recently, the Vanity Fair Oscars after-party.