Justin Timberlake and Jessica Biel are celebrating their fifth wedding anniversary, and the singer wrote a sweet love letter on social media this week — and it’s super freaking sweet.

“Today is even more special for me because five years ago, on this day, I became the luckiest man in the world when I exchanged vows with my best friend,” he captioned the throwback video of himself singing Leon Russell’s 1970 classic, “A Song for You,” which the actor recalled “was our first dance.”

“To my beautiful Jess: You have taught me so much about what a true love means. I can’t put into words what these last five years have meant to me, so… ‘Listen to the melody ‘cause my love is in there hiding,’ ” he concluded, along with the hashtag #Happy5thAnniversaryWifey.

On Instagram, he ended his post with an adorable shot of himself sharing a smooch with Biel.

#TBT to a late night freestyle session on a break in the studio – YES I’ve been back in the studio cooking! But, today is even more special for me because five years ago, on this day, I became the luckiest man in the world when I exchanged vows with my best friend. This song was our first dance. To my beautiful @jessicabiel : You have taught me so much about what a true love means. I can’t put into words what these last five years have meant to me, so… “Listen to the melody ‘cause my love is in there hiding…” #Happy5thAnniversaryWifey #ASongForYou

A post shared by Justin Timberlake (@justintimberlake) on Oct 19, 2017 at 7:44pm PDT