We know it's quite the thing to be fashionably late when you're a big star like Katy Perry, but the US star might want to invest in a new watch after feeling the wrath of fashionistas who she kept waiting at Milan Fashion Week.
After reportedly rocking up to her friend Jeremy Scott's first collection for Moschino 50 minutes late, the 'Roar' singer was greeted by a chorus of boos from the crowd as she posed for photos on the catwalk.
And how did Katy respond? By telling everyone to 'shut the f*** up' of course!
Watch the video above to see it all kick off...