One Direction might have debuted at No. 2 on the Billboard charts behind Justin Bieber, but they won the top award at Sunday's American Music Awards, hosted by Jennifer Lopez. "This is a testament to how incredible our fans are," Louis Tomlinson said onstage at the Microsoft Theater in Los Angeles. "We just want to thank everyone [who's] helped us in the last five years," Liam Payne added. The band won the top award at last year's show as a quintet with Zayn Malik. They also won favorite duo or group—pop/rock Sunday night. Bieber, who, with Diplo and Skrillex, won best collaboration, closed the night with a medley of his hits, including "Sorry," ''Where Are U Now," and "What Do You Mean."
Bieber's performance wasn't the only well-received one: Celine Dion paid tribute to the victims of the recent Paris attacks by singing Edith Piaf's "Hymne a L'Amour" in French as some audience members cried. The Weeknd's performance was also a favorite, and he walked away with two awards. Nicki Minaj was also a double winner, taking home favorite artist and album—rap/hip-hop. Taylor Swift, who's out of the country shooting a music video, was the top nominee with six. She won song of the year for "Blank Space," favorite album—pop/rock for "1989," and favorite artist—adult contemporary. Swift lost favorite female artist—pop/rock to Ariana Grande, who was shocked when accepting the honor. "I think I owe a lot of this to my nonna, who made sure to remind me that she voted," she joked. (Read more American Music Awards stories.)