From Britney Spears to Ariana Grande and Rihanna - find out what the world's biggest pop stars are wearing to the 2016 Billboard Music Awards

They may not have quite the same prestige as the Grammys, but sometimes, the numbers don't lie. The 2016 Billboard Music Awards have kicked off in Las Vegas and they're set to award the year's biggest chartbusters. With the awards based on recording industry sales and airplay data, think of these as a confirmation of chart success, rather than voting popularity.

With big name singers such as Rihanna, Britney Spears, Ke$ha and Ariana Grande storming the pink carpet, as well as actresses like Kate Beckinsale, Jessica Alba, Mila Kunis also making an appearance - click through the gallery above to see what they're wearing.

Billboard Music Awards 2016: on the red carpet