Niall Horan was a big Justin Bieber fan back before One Direction existed, and now there's video proof of his love for the Canadian crooner.
Eight seconds in, D'Ambrosio pans over to show Liam watching Niall Horan and his pals sing. He's sporting the Biebs' old hairstyle, and he looks just a little jealous. Perhaps he was thinking, "I know you are not trying to play the acoustic version of my hero's hit song!" But he eventually quits being a diva and sits down right behind Niall, and of course he starts singing along; it's physically impossible not to sing along to "Baby," after all.