Beyoncé just stopped the show before it began!
Ch-ch-check out the AH-Mazing opening performance (above)!
Even with a mouthful of braces, these two bestiez showed off their incredible musical abilities on the show, harmonizing something fierce!
Their antics were apart of Late Night's Timberlake Tuesdays, which has JT joining JF each week to promote the release of The 20/20 Experience: 2 of 2 on September 30th!
Ch-ch-check out their performance (ABOVE) and mourn the loss of summer…AT THE SAME TIME!!!