Fresh from an elevator prank with the legendary Paul McCartney, Jimmy "High Jinks" Fallon shared another gag with "Tonight Show" viewers Thursday.

This time, the talk show host collaborated with the recently engaged Justin Bieber on a "Musical Photobomb," treating oblivious fans in Central Park to a lip sync performance of Bieber's 2015 track "What Do You Mean?"

The duo seemingly went undetected using wigs, sunglasses and mustaches to conceal their identities. Energetic dance moves, including some very impressive flossing, were on full display.

More:Hailey Baldwin shows off massive engagement ring from fiancé Justin Bieber

More:Jimmy Fallon vomits, Ryan Reynolds downs blood cocktail during disgusting game of Drinko

At the segment's end, the two removed their wigs and 'staches and The Biebs posed for pictures with fans.

If popular singers in disguise are your thing, check out the "Tonight Show" segments below:

More:A totally recognizable Miley Cyrus gives subway performance undercover

More:Jimmy Fallon and Christina Aguilera shock subway riders by singing incognito