Lorde opts for a hat and smart black dress as she sings 'Tennis Court' at the event. This image appears in the gallery:Billboard Music Awards 2014: The 25 Pictures You NEED To See 16. Lorde opts for a hat and smart black dress as she sings 'Tennis Court' at the event. Picture: PA 25 images See the full gallery: Billboard Music Awards 2014: The 25 Pictures You NEED To See