Justin Timberlake doesn't just release a song at the drop of a hat. First he made multiple Instagram posts about his new single to offer us ringside seats. Katy Perry beat him to the punch (and "Eye of the Tiger," and "float like a butterfly, sting…
With the city's iconic Brooklyn Bridge towering behind her, Perry took the stage -- made to look like a boxing ring -- in a tiger-print sports bra and silk boxing shorts. She then proceeded to sing "Roar," the debut single off her upcoming third album…