Did Pippa pad posterior for royal wedding dress?

Kate Middleton arrives with her father Michael and sister Pippa at Westminster Abbey before Kate's marriage to Britain's Prince William in central London April 29, 2011. (ROYAL WEDDING/VIP) REUTERS/Toby Melville (BRITAIN - Tags: ROYALS SOCIETY ENTERTAINMENT) - RTR2LR29

Pippa Middleton may have been cheating when her derriére stole the show at 2011′s royal wedding.

One of Europe’s top royal experts is accusing the Duchess of Cambridge’s younger sister of using artificial means to fill out the Sarah Burton for Alexander McQueen bridesmaid dress she wore for the event, the Daily Mail reports.

“Of course she had a false bottom,” etiquette expert Stephane Bern, 50, said on his French TV show Monday. “It was an optical illusion. She knew there were a billion people watching. It was the moment to show it.”

Bern didn’t bother to elaborate as to where he got his info or how exactly Pippa would have accomplished the feat, but recent comments made by Middleton won’t do anything to sway conspiracy theorists.

Speaking at an event in London this past February, she said, “As I have found out recognition has its upside, its downside and — you may say — its backside,” before admitting that her bridesmaid gown may have “fitted a little too well.”