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Several London beauty experts are claiming Pippa Middleton's enviable derriere at her sister's royal wedding in April wasn't the result of squats, but came from some extra padding.

The experts share their opinions on what has been jokingly called the eighth wonder of the world in a new TLC special, "Crazy About Pippa," which aired last week, US Weekly reported.

"I'm not convinced that it's completely natural," London spa owner Lesley Reynolds Kahn said. "Because I think, if you look at other photos of her and you see her in jeans, she's got quite a flat bottom."

"I think possibly for the day, for that gorgeous dress, she may have had some sort of pants that gave her a little bit of a lift, or even a little bit of padding," Reynolds Kahn said.

She added that ever since the wedding, her spa has been inundated with requests for Middleton's fabulous bottom.

The athletic Pippa, who became a fashion and fitness icon after wowing the world at Kate's wedding to Prince William, is a workout fanatic who runs, cycles, skis, swims and does Pilates.