Now the world has some idea what Pippa Middleton's form-fitting royal wedding gown was hiding.

A photo has emerged of Middleton wearing a bra and a skirt while dancing with a man wearing only boxers.

It's unclear when the photo was taken.

Middleton isn't the only one in her family who has had a photo scandal. Semi-nude photos of her brother James also have appeared.

After Pippa Middleton appeared last week at her sister Kate's wedding to Prince William in the white gown, mesmerizing the male half of the 2 billion people watching around the world, social networking sites immediately went wild for her.

"Pippa Middleton looks absolutely stunning! I think I am in love," was among other, less decorous, comments. Many immediately inquired, rather hopefully, whether she was single.

The answer seems to be no. She is reportedly dating Alex Loudon, an old Etonian former cricketer, who played once for England.