Taylor Swift became the American Music Awards' most-decorated female artist, totaling 23 wins.
Vanessa Hudgens evoked old-Hollywood glamour with a blush pink silk dress.
Dua Lipa was nominated for New Artist of the Year and performed ''Electricity'' and ''One Kiss.''
Shawn Mendes won one of the first awards of the night: Favorite Artist Adult Contemporary.
YouTube makeup artist Patrick Starrr matched the red carpet with vibrant hues.
''Crazy Rich Asians'' star Constance Wu dazzled in a sequined mini dress.
Cobie Smulders, who played Robin Scherbatsky on ''How I Met Your Mother,'' attended the show with husband Taran Killam.
Halsey and G-Eazy arrived together on the red carpet. Halsey later performed ''Eastside'' with Khalid and Benny Blanco.
Supermodel and TV personality Tyra Banks presented New Artist of the Year.
Khalid won Favorite Male Artist Soul/R&B.
Post Malone flashes his tongue at photographers. He won Favorite Male Artist Pop/Rock.
Camila Cabello took home four awards: New Artist of the Year, Favorite Song Pop/Rock, Collaboration of the Year and Favorite Music Video.
Cardi B won Favorite Song Rap/Hip-Hop, Favorite Song Soul/R&B and Favorite Artist Rap/Hip-Hop.
XXXTentacion's family attended the awards on the late singer's behalf.
Mariah Carey debuted her new single, ''With You,'' at the AMAs.