Watch below, but basically a fan asked Katy to pick from a list of possible songs only...every single option was 2013's "Who ...

Katy Perry Lashes Out at Fan After They Suggest She Sing Ex John Mayer's Song: 'Satan!' Donald Trump's executive order changing 401 (k)s: What to know ...

Katy Perry has been making her way around the world and space this year. Some of her outfits have been stunning, while others missed the mark.