Hot musicians and their plus-ones stole the spotlight at Sunday night's Billboard Music Awards in Las Vegas. New couple Taylor Swift and Calvin Harris showed cute PDA [1] when she won one of the night's first awards, and host Chrissy Teigen made a point to give her husband, John Legend [2], more than a few sweet shout-outs during the show. Meanwhile, Britney Spears was all smiles with Charlie Ebersol [3], and Jennifer Lopez [4] and her rumored on-again boyfriend, Casper Smart [5], made one superhot pair. Check out all the cute couples at the Billboard Music Awards, and then see all the stars on the red carpet [6]!

Britney Spears and Charlie Ebersol

Taylor Swift and Calvin Harris

Olivia Culpo and Nick Jonas

Casper Smart and Jennifer Lopez

Nick Young and Iggy Azalea

Brantley Gilbert and Amber Cochran

Chrissy Teigen and John Legend