Russell Brand was kicked out of the GQ Men of the Year awards party after making a Nazi joke about the event's sponsor Hugo Boss on stage.
The 38-year-old comedian and actor, who picked up the Oracle award at the show, critisied the German fashion brand for designing the Nazi uniforms worn during World War II.
Brand also placed a finger under his nose to mimic the Adolf Hitler moustache and did a Basil Faulty-style comedic goosestep across the stage.
The Forgetting Sarah Marshall star took to the stage after Mayor of London Boris Johnson picked up the gong for Politician of the Year.
After Johnson joked about the recent alleged chemical attack in Syria, Brand said: "Glad to grace the stage where Boris Johnson has just made light of the use of chemical weapons in Syria meaning that GQ can now stand for genocide quips.
"I mention that only to make the next comment a bit lighter because if any of you know a little bit about history and fashion, you'll know Hugo Boss made the uniforms for the Nazis.
"But they did look f*****g fantastic, let's face it, while they were killing people on the basis of their religion and sexuality."
Brand was then ejected from the awards ceremony's after-party following the joke about the event's £250,000 sponsor, reportedly shouting "Nazi sympathisers" as he left, according to The Sun.
Brand then tweeted an argument he had with GQ editor Dylan Jones to his near-seven million followers. He wrote: "GQ editor: 'What you did was very offensive to Hugo Boss.' Me: 'What Hugo Boss did was very offensive to the Jews.'"
The joke from Brand kicked off a series of insults hurled between award winners during their acceptance speech.
Collecting the Writer of the Year award, Charles Moore took the opportunity to mock Brand for the infamous phone call he made to Faulty Towers actor Andrew Sachs.
He said: "I was very interested when Russell Brand praised the stylishness of the Nazis, because of course that fits with the fact that they persecuted the Sachs in the 1930s when Andrew was a young man, and his family fled to this country.
"And then he was persecuted by Russell Brand and Jonathan Ross in their disgusting telephone call."
US actor Jeremy Piven, presenting the TV personality award to Piers Morgan, also criticised Brand while onstage: He said: "This event is going on longer than my bar mitzvah, and I've been sitting in the corner sweating like a Hebrew slave.
"So thank you Russell, for pointing out the people that killed six million of my people."
The Who singer Roger Daltrey landed another blow towards Johnson after he picked up the Editor's Choice award.
The 69-year-old said: "When I was listening to Boris's speech I was reminded of the wonderful lyric that I sang when I was 19 years old: 'I hope I die before I get old'."