Johnny's character endures an embarrassing incident

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Johnny Depp had an undignified onscreen moment on the set of his new flick Mortdecai in London earlier this week.

The actor, 50, was snapped with his trousers around his ankles as he filmed a scuffle with a shaven-headed man and a biker on Monday.

Johnny‘s character – who sports a handlebar moustache – was left looking sheepish after his kecks were pulled down, displaying a pair of printed boxers, garters and long red socks.

Mr Depp‘s top half was clad in a smart shirt, waistcoat and jacket while his dyed blond hair was slicked back off his face.

Mortdecai tells the story of art dealer Charlie Mordecai, who travels the world hunting down a stolen painting said to contain a secret code that will lead to hidden Nazi gold.

Johnny – who’s dating his The Rum Diary co-star Amber Heard – plays the lead role in the film.

It’s based on popular book series The Mortdecai Trilogy by British writer Kyril Bonfiglioli.

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Anna Duff