Kate Moss insists she was joking when she stormed out of the GQ Men of the Year Awards last week.

The supermodel - who was caught on camera shouting expletives after reportedly taking offence to a joke made about her by actor James Nesbitt - claims she and pal Lily Allen had already planned to leave early and was just showcasing her "quirky sense of humour".

A source said: "Kate was messing around when she pretended to storm out. She was winding James up about his smutty remark. They've been pals for years.

"Kate and Lily had already decided to leave the bash straight after dinner and head back to their hotel suite for a party."

Backstage at the awards, Kate also interrupted an interview with rapper Dizzee Rascal, claiming she had lost her lipstick.

The source added to Britain's Daily Star newspaper: "Kate has a wicked sense of humour. She wanted to wind Dizzee up by butting in and pretending she'd lost her lipstick.

"Come on, as if Kate cares! She has thousands of lipsticks.

"People don't realise she loves taking the p**s and isn't afraid to laugh at herself. She doesn't take life that seriously."