Katy Perry. Photo: Wikimedia Commons.

American pop star Katy Perry is taking heat after she wore a gown designed by notorious antisemite John Galliano to the MET Gala in New York City on Monday.

The TMZ gossip website blasted the “Bon Appetit” singer — a co-chair of the event — for donning an “ugly red outfit by [a] Jew-bashing designer” and PopCrush said it was “terribly troubling” that Perry would choose to support someone “known for his extreme antisemitism” by wearing the red Maison Margiela dress.

Galliano was fired from his role as creative director at Christian Dior in 2011 after he went on an antisemitic rant at a Paris bar in which he declared, “I love Hitler,” and told two women their mothers and “forefathers would all be f–king gassed.” A video surfaced not long after showing Galliano making similar comments at the same bar about a year earlier.

The UK’s Independent newspaper said on Facebook that Perry, who is not Jewish, made an “extremely controversial choice” by choosing to wear a garment made by Galliano, and one social media user who disapproved of the look said, “This is terrible just terrible how could she!!!!!!! [Galliano] insulted the mighty Jews I need a cold shower from the shock.”

Others on Twitter called the singer’s gown selection “offensive” and attacked her for not being “classy.”

Some social media commenters defended Galliano, with one saying he “deserves a second chance in life” and another declaring that “‘journalists’ who are claiming that Katy Perry supports Jew-bashing because she wore Galliano need to calm the f–k down — spoken as a Jew.”

In 2016, Perry touted the benefits of Shabbat during an interview with Cosmopolitan and prior to that, in 2014, she disguised herself as a Jewish performer in the music video for her song “Birthday.” The singer has never spoken out negatively about Jews, but her father — an Evangelical preacher — drew public attention in 2012 after making offensive comments about Jewish people during a church service.

This is not the first time a celebrity has stirred controversy for wearing a Galliano gown to a MET Gala. Amal Clooney — the British-Lebanese human rights lawyer married to American actor George Clooney — wore one of Galliano’s designs, also red, to the annual event in 2015.