The lawyers were duly called in and many of the images scrubbed from the internet.
The surprising image stood in stark contrast to her usually polished image.
Unfortunately, Pippa wasn't the only Middleton who was facing undue exposure.
It looked like just the sort of perhaps boozy hijinks one would expect privileged 20-somethings would get up to in between studying at sandstone colleges.
St Barts has long attracted wealthy Europeans including Roman Abramovich, who bought a £49million mansion there and has moored his yacht on its shores.
Within hours, Pippa's bottom had its own Twitter and Facebook accounts and was trending on social media.
The dark-haired beauty, the future Duchess of Cambridge, she looks more than fuckable with her panties in full view.
Description: Both Michael and James opted for bold designer board shorts featuring images of idyllic beach scenes - similar to those famously worn by ex-prime minister in Corsica in 2016.