Adele's sophomore album has hit the decade mark! The vocal powerhouse celebrated 21's Jan. 24, 2011, anniversary of the U.K. release date with a little note on Instagram.
"Well I never! Happy 10 years old friend! It's crazy how little I remember of what it was like and how I felt a decade ago," she captioned the mini photo gallery, which kicked off with a cover image from the album. "But Thank You from the bottom of my heart for letting us into your lives and letting me be a soundtrack to some of it x." (See her full post and photos on Instagram.)
Though 21 was released in Europe in January 2011, it wasn't released in North America until Feb. 22, 2011. It went on to become her first album to top the charts in the United States; it reached No. 1 on the Billboard 200 in March 2011.