Pippa Middleton has been accused by French royal watcher Stephane Bern of wearing a "false bottom" during the royal wedding to steal the show from big sister Kate, the future Duchess of Cambridge during an interview on French TV.

The maid of honour won worldwide fame thanks to the uber tight Alexander McQueen gown at the ceremony in 2011 but according to the etiquette expert and Knight of the Order of Grimaldi in Monaco, it wasn't all her under that dress. In an exert from his French chat show, Bern makes the astonishing claim, saying: “But of course she had a false bottom. I repeat it, she had a false bottom."

“You take her away from that and she has normal buttocks. It was an optical illusion," he went on.

“She knew there were a billion people watching. It was the moment to show it.”

Pippa stunned at the royal wedding in April 2011 (Anwar Hussein/WENN)

Back in February at her first public speaking engagement, Pippa had joked that her dress might have been a bit on the tight side.

“As I have found out, recognition has its upside, its downside and – you may say – its backside,” she said of her infamous dress at the Women in Advertising and Communications Dinner, adding, “in retrospect maybe it fitted a little too well”.

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