The pop star performed in a Geisha-style getup and the stage and props followed the same theme.
Unfortunately, not everyone loved Katy's costume of the theme she chose.
Many angry fans took to Twitter, calling the singer "racist" and "insensitive."
"Leave it to Katy Perry to perform the most racially insensitive opening act," one user wrote. "Culture is not a costume, folks!" another chimed in.
To make matters worse, the vocals were a little rough, with Katy over-singing a majority of the song...but hey, at least we know she wasn't lip-syncing!
Check out the video below and tell us what you think of the theme Katy chose. Do you find it offensive?
Want More? Like us on Facebook
Gallery | American Music Awards 2013: Red Carpet Arrivals!