It's like the '80s exploded all over the "Last Friday Night" music video. It's so neon! Katy — or Kathy in the video — goes from the nerd to bombshell with Rebecca Black's help (yes, the Rebecca Black who sings "Friday") and has the most insane night ever.
What to wear: A denim romper with a pink turtleneck. You also need headgear and glasses. Make your hair as big as possible — it's the '80s, y'all!