Last Thursday, during the Moschino show in Milan, Katy Perry reportedly shouted "shut the f*ck up" at photographers as she posed at the end of the catwalk.
The foul-mouthed rant came as Katy arrived late for the Italian fashion house's show, and had jumped up on the catwalk to pose for photographers.
However, her model stint proved unpopular with the crowd, who had been waiting for nearly an hour for the star to take her seat, and as such it was met with boos from the audience and photographers.
Katy then turned around and told them that they would get their photos, and launched in a expletive-ridden speech.
According to local reports, Katy arrived 50 minutes late to the show, which was met with disapproving noises from the audience of fashionistas and photographers, as the presentation couldn't begin without her.
Watch Katy Perry as she shouts at photographers during Milan Fashion Week
The singer was a one of the special guests at the show, which debuted her friend Jeremy Scott's first collection for Moschino, and was unsurprisingly dressed head to toe in Moschino.
Although another guest of honour, Rita Ora, also turned up late, Katy was given all the blame as she was the last person to take her seat.
Katy hit the headlines again today as she shared a kiss with Miley Cyrus, who was on stage at the time performing for her Bangerz tour.
She was also seen partying at the Brit awards last week with the likes of DJ Nick Grimshaw and Kylie Mingoue, after her performance at the UK music awards show.