Fuller House Theme Song, 'Fuller House' Duet

Getty Images

Bob Saget and Carly Rae Jepsen Sing 'Fuller House - Drop everything you're doing! Carly Rae Jepsen and Bob Saget performed the Fuller House theme song together!

The Tanner family patriarch surprised Jepsen fans by joining the "Like You" singer during her concert in Milwaukee, Wisconsin, on Friday night.

WATCH: Jodie Sweetin Officially Joins 'Dancing With the Stars' as 'Fuller House' Gets Renewed

Of course, it's not too surprising the pair know each other, seeing how 30-year-old Jepsen's special rendition of "Everywhere You Look" can be heard during the opening credits of Netflix's Full House reboot, but their duet definitely was. Watch below: