The 29-year-old singer is being accused of "appropriating Asian culture" for her Sunday night performance in which she donned a pink kimono accompanied by heavy eye make up and traditional dance.
"Katy Perry just started the #AMAs w/ offensive cultural appropriation, yellow face, and flying geishas. What the flying Asian f***?? #racist" tweeted user @katiekraze.
"Lol way to play the racist card Katy Perry," @ascendescend wrote.
Perry warned fans that she would be "taking them on a trip" in a tweet she wrote before the performance. And for some AMA watchers her performance was perfectly harmless.
"Katy Perry wears vaguely oriental/Japanese style clothes. Gets called racist. The world has gone mad," @strebby1wrote on Twitter.
Perhaps the controversy is tied to a comment she made during Jimmy Kimmel Live in June while speaking about Japanese culture.
"I’m so obsessed with you," she said. "I want to skin you and wear you like Versace!"
You can check out Perry's performance below.