British royal Princess Beatrice had her own dress faux pas at the Fashion Rocks shindig on Thursday night after it proved a little more revealing than she intended.

In a night of flesh-baring, Beatrice got in on the act by nearly revealing her chest in her oversized dress.

An onlooker tells The Sun, "Beatrice looked stunning however her dress was a bit too big.

"She had to keep hoisting it up to protect her modesty."