The singer's beau John Mayor apparently skipped out on the musical event for some shopping instead, but Katy brought it in the style dept on the red carpet and onstage.
Here's how to get her look:
1. Apply two coats of Sally Hansen Triple Shine Nail Color in 'Slick Black' as a base color.
2. Use Sally Hansen Hard As Nails Xtreme Wear in 'White On' to create the dots.
3. For a flawless finish, apply Sally Hansen Triple Shine Top Coat to seal the nail art and enhance shine.