Kanye West performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. 
Niall Horan, from left, Louis Tomlinson, Harry Styles, and Liam Payne of One Direction accept the award for top touring artist at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas.
Ed Sheeran performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas.
Zendaya, from left, Hailee Steinfeld, Taylor Swift, Lily Aldridge, and Martha Hunt arrive at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. 
Iggy Azalea, left, and Charli XCX accept the award for top rap song for “Fancy” at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas.
Nick Jonas performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. 
Celine Dion poses in the press room at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas.
Mariah Carey performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas.
Taylor Swift accepts the award for top billboard 200 album for “1989” at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. LAS VEGAS – Taylor Swift dominated the Billboard Music Awards with eight wins, including top artist, while Kanye West was booed during his performance that closed the three-hour event.
Swift also won top Billboard 200 album and top female artist Sunday night.
“Oh, this is such a good night!” she said after winning the top prize, besting One Direction, Ariana Grande, Sam Smith and Ed Sheeran. “Early this morning I watched my brother Austin graduate from Notre Dame … (and) to anyone who’s graduating this year … this is for you.”
“This is kind of a graduation for us,” Swift said to the audience of top musicians.
West, however, was booed during his smoky performance of “All Day.”