Royal relative Pippa Middleton may face criminal charges in France for being among a group of friends who jokingly brandished a pistol at a photographer.

Middleton, younger sister of Kate Middleton and the sister-in-law of England's Prince William, was in the passenger seat of an Audi convertible with three male friends Sunday when the driver brandished a gun at a French photographer behind them, the British newspaper The Sun reported.

The photographer captured a series of images of the weapon and of Middleton grinning.

The paper said that in France, displaying a gun in a public place is punishable by up to 7 years in jail for all parties involved, with a 2-year maximum for a fake gun.

Duncan Larcombe, The Sun's royal editor, told "Good Morning America" Monday that the photographer may file a police complaint. "We're told he isn't ruling anything out yet," Larcombe said.

Buckingham Palace, which does not represent Middleton because she is not a member of the royal family, has issued no comment, according to ABC News.

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The British newspaper the Daily Mail identified one backseat passenger as Paris fashion entrepreneur Arthur de Soultrait. Middleton had been attending his 29th birthday party at a theater-turned-nightclub in the St. Germain-des-Pres district, leaving the event at 6 a.m. Sunday.

The other two men were not identified. They were driving to Paris' Gare du Nord station, where the Eurostar high-speed train departs for London, the paper said.

Paris is particularly sensitive to guns after suffering a spate of killings this year.