Justin Timberlake Talks Voting Booth Selfie Gaffe on 'Fallon'

Host, pop star also test bromance during "Best Friends Challenge"

Justin Timberlake copped to his voting booth selfie gaffe and played the "Best Friends Challenge" with Jimmy Fallon on 'The Tonight Show' Wednesday.

Justin Timberlake discussed his overzealous voting booth selfie and joined Jimmy Fallon for a round of the "Best Friends Challenge" on The Tonight Show Wednesday.

While chatting with the host, Fallon asked the pop star what he'd been up to lately, to which Timberlake replied a bit bashfully, "I recently voted. Super quiet, under the radar." Earlier this week, Timberlake cast an early ballot in Tennessee and posted of a photo of himself at the booth to Instagram with a caption encouraging people to vote – only to find out later that Tennessee passed a law in 2015 prohibiting photos inside polling locations (the Shelby County district attorney was not interested in investigating the matter).

On Fallon, Timberlake reiterated his plea that people get out and vote, and then joked: "But don't take a picture of yourself. I had no idea! I was like, 'This is gonna be great! And inspire people to get out and vote!'"

Later, Fallon broke out the Best Friends Box as he and Timberlake played a round of the Newlywed Game-esque "Best Friends Challenge." In an adorable display of their bromance, the pair giggled through correct answers to their favorite mode of transportation while hanging out and favorite song to sing together. The former was a tandem bicycle, while the latter was a random song by the group Hayseed Dixie called, "Poop in a Jar."