This was not only the group's first American Music Award nomination, but it is also now their first award from this show. He won best new artist at the BET Hip-Hop Awards this month.
On Sunday, Swift provoked a storm by breaking her silence on politics and announcing she would vote for two Democrats in Tennessee in the US congressional midterm elections in November. After she urged her fans to vote on Sunday evening, and supported Democratic candidates, the voter registration numbers have spiked, Conservatives are reacting, even Trump commented, and the world has sat up to take notice of this young woman asserting her political voice for the first time.
XXXTentacion's mother, Cleopatra, accepted the prize on stage, she said: "I am honoured".
Like Cardi B's performance, rising newcomer Ella Mai also won over the crowd when she sang the year's biggest R&B hit, Boo'd Up, starting the performance as she walked down the aisle of the Microsoft Theater.
The musician, who hasn't attended the AMAs since 2014, is up for four of tonight's top awards: Artist of the Year, Favorite Pop/Rock Female Artist, Favorite Pop/Rock Album and Favorite Tour.
South Korean boy band BTS arrive at the awards.
The three-hour show closed with a rousing tribute to Aretha Franklin, who died in August. Other performers include Cardi B with Bad Bunny and J Balvin, Mariah Carey, Carrie Underwood, twenty one pilots and Jennifer Lopez.