AJ McLean's pit stop on the Vegas Strip -- during the Formula 1 Grand Prix festivities -- had A-listers doing laps around the glitzy event, and got AJ onstage with The Chainsmokers.
The Backstreet Boys star put the pedal to the medal inside XS Nightclub at the Wynn Las Vegas Thursday night, as the trio performed a special rendition of his band's mega-hit "Everybody" -- but not before F1 superstar Lewis Hamilton and Will.i.am kicked things off at the exclusive invite-only opening ceremony the night before.