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| Beautiful Kate Middleton |
She will surpass even her husband's late mother, Princess Diana.
The bride-to-be, who will become part of the Royal Family after she marries on April 29, came third in the survey, one place ahead of Diana, Princess of Wales.
Princess Grace of Monaco - Oscar-winning actress Grace Kelly - topped the poll, followed by Queen Rania of Jordan.
Princess Margaret was the only other female British royal to make the top 10, taking the ninth spot.
The survey of 127,000 people was carried out by dating website BeautifulPeople.com.
Prince Carl Philip of Sweden came top among royal men, while Prince Harry beat his brother to be named the fourth best-looking royal.
His brother was fifth and surprisingly their father Charles, the Prince of Wales, was voted the 10th best-looking royal male.
The Princess Royal was the lowest ranking royal in the beauty stakes, according to the poll.
Greg Hodge, managing director of BeautifulPeople.com, said: 'Kate Middleton is no typical beauty.
'But her style, deportment and immaculate grooming have clearly won her an army of admirers, propelling her to the same heights as Princess Grace and Queen Rania.
'I think the world is breathing a sigh of relief that the British monarchy can only get better looking in generations to come.'
Mr Hodge added: 'Harry is known to have the cheeky jet-set playboy within him.
'That probably resonated with voters, along with the fact that he's still a bachelor.'
