As Cyrus continues to reform her image from raunchy wild child to modest, emotional pop crooner, she delivered a debut performance of her new, low-key single "Malibu".
While BTS is the first K-Pop group to receive a Billboard Music award, they are the 2nd Korean act so far. He sang Gyalchester, while standing in the center of the fountain outside the Bellagio, with water cascading down around him.
Ludacris and Vanessa Hudgens will host the show.
Drake has made a habit of skipping awards shows in recent years - even the 2016 Grammys, for which he was a top-nominated artist.
When Cher got up to accept her Icon Award, she wasn't afraid to do a little bragging.
She had previously said of the invite to sing it at the bash: "This song means a lot to me, and it has played such a huge role in my career".
Cher - presented with the Icon Award for lifetime achievement - took to heart the title of her 1989 hit "If I Could Turn Back Time", singing it in a black fishnet suit and leather jacket as in the original video.More news: President, Gandhis pay tributes to Rajiv
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"I have wanted to do what I do since I was four years old", said Cher.
A moment of silence was observed during the 2017 Billboard Music Awards on Sunday for Soundgarden frontman Chris Cornell who was found dead Thursday in his hotel room in Detroit.
Dan Reynolds, the singer of the rock band Imagine Dragons, praised as a "true innovator" saying he was a "prolific songwriter, a legendary performer, a singer who had a voice for the ages and a philanthropist".
There were no surprises during Dion's performance - it was safe a bet as any in Vegas to put one's money on her ability to pull out all the stops on this particular performance, which was enhanced by clips from the film. She impressed early with her rapping skills to show her love for Nicki Minaj, then tried a heartfelt rendition of Dion's "The Power of Love".
We all knew the Canadian songstress' touching performance of "My Heart Will Go On" would bring down the house, but no one could have anticipated her epic, hard-to-describe cloud dress.
Actress and singer Cher served up her greatest songs and fashions during her performance at the Billboard Music Awards on Sunday.