London, Apr 17 (ANI): Pippa Middleton attended pal Arthur de Soultrait's wild 30th birthday bash in Paris, just hours before her pal's gun prank.

The raunchy costume party held in a city theatre featured dwarfs and strippers and also included kinky masks, bondage outfits and a woman fire-eater, making sparks fly with a power tool.

It was staged the evening before Pippa, 27, was plunged into a storm, which appears certain to lead to her being questioned by French police, the Sun reported.

She was snapped riding as a passenger in a convertible Audi and laughing while the driver evidently aimed what looked like a semi-automatic pistol at a photographer behind the vehicle.

Police are investigating the pictures after receiving a formal complaint about the incident, which happened as Pippa was being driven to the city's Gare du Nord station to catch a Eurostar train to London. (ANI)