Kate Moss poured drinks straight down guests' throats at a GQ after-party in the early hours of Wednesday morning.
The 41-year-old model - who hadn't even attended the GQ ceremony at the Royal Opera House - reportedly let her hair down at the star-studded bash by serving up vodka tonics and wandering around with Sam Smith while singing at the top of her voice.
"She made herself at home and went round the other side of the bar, then started pouring very large vodka drinks for everyone," a source shared.
"She and the barmaid were pouring them straight into people's mouths. Everyone was having a great time."
The raucous nature of the party - which was also attended by the likes of Simon Le Bon, Lewis Hamilton and Nicholas Hoult - meant the police ended it prematurely at around 4am due to "excessive noise".
PR guru and party host Matthew Freud, who staged the bash at his multi-million pound property in London's Primrose Hill, later apologised for the disturbance.
An insider told the Daily Mirror newspaper: "He of course apologises if any neighbours were disturbed. There may have been some commotion when some of the guests left due to a large number of paparazzi outside.
"While police did attend for a short period they were happy with the situation."