The image, released to the Sun by the French photographer at whom the pistol was aimed, shows Middleton, the younger sister of the Duchess of Cambridge, Kate Middleton, looking back at the paparazzo and grinning as her friend, the driver, reaches down and aims what appears to be the gun.
Middleton was reportedly in Paris to attend a costume birthday party at the Chez Raspoutine as a guest of fashion label owner Arthur de Soultrait, also a passenger in the car when the gun incident occurred.
"Pippa is a party girl. She mixes now in very high society and they don't come very higher than this group of French aristocratic sons," Larcombe said of the three men Middleton was photographed with.
Adding to potential trouble for Middleton is the fact that the incident happened in Paris, a city on high alert when it comes to guns after a string of killings swept and shocked the city earlier this year.
Paris is also the city where, in 1997, England's most famous royal, Princess Diana, the mother of Prince William, died in a car crash after being chased by paparazzi.