Britain's new princess will be a strong-willed and innovative free spirit who will re-energize the royal family, Chinese fortune tellers predicted on Sunday.

The daughter of Prince William and his wife Kate was born on Saturday, falling under the Chinese zodiac sign of the sheep and with a personal element of earth, according to the ancient Chinese practice of feng shui.

Her birthday combination is "a very strong one," feng shui expert Thierry Chow told AFP.

 "It indicates that she will give good luck to her family," Chow said.

"Being born in the sheep year has certainly helped to create this lucky combination,"  he added.

"She has artistic talent and does not like to stick with the status quo, unlike her brother who will be more disciplined and reserved," said Mak Ling-ling, another Hong Kong fortune teller, referring to Prince George, almost two years older, who was born in the Year of the Snake.

"She will be a happy girl, someone who does not like to follow discipline. When you set rules for her, she'd rather be herself," Mak said.

Yet to be named, the baby is the first princess born into the British royal family since Princess Eugenie, daughter of the queen's second son, Prince Andrew, 25 years ago.