Prince William’s sexy sister-in-law was last night facing a grilling by outraged cops over the antics in Paris — as it reels from a series of gun massacres across France.
Three male chums were with her in an Audi convertible.
The driver took out the weapon and brandished it in broad daylight.
He waved it in the air and pointed it at a photographer — whose snaps show the chilling moment the barrel of what looks like a semi-automatic stared straight down his lens.
Last night the Paris Judicial Police were poised to launch a probe — as a source revealed Pippa faces ARREST amid a gun clampdown.