What's the best way to kick off summer? With the Billboard Music Awards, of course.
On Sunday night, singers, actors and other Hollywood big shots flocked to Las Vegas to celebrate the best in music -- but we were really focused on the outfits.
Ciara was sparkly perfection in a silver gown, Meghan Trainor made a case for shoulder pads and Britney Spears was ... Britney Spears, wearing underwear and not much else.
Check some of our favorite red carpet looks of the night: