Kate Middleton has 'royal' presence

Britain's Kate Middleton already acts like a member of the royal family according to photographer Mario Testino .

Mario - who was asked by Prince William and Kate to take the engagement photos last year ahead of their April 29 wedding - also revealed the couple "glowed" with love for each other.

He said: "I already felt very confident that she would be an easy sitter, as she has natural grace, a very open personality, and a beautiful face and posture....It was a real treat to photograph her."

The photographer - who first met the 29-year-old brunette at an exhibition of his iconic portraits of William's mother Princess Diana in 2005, added to Britain's Daily Telegraph: "She has already developed a perfect sense of royal responsibility, she brings life, a delightful sense of humour, and joy into the room when she walks in."

He also revealed he helped Kate choose one of her outfits for the photo shoot and said: "Even someone as photographed as the Royal Family needs to feel completely comfortable if they are to look their best."

The photographer admitted he was inspired by Cecil Beaton's photographs of the Queen Mother and Norman Parkinson's pictures of the Duchess of Devonshire - as well as William and Kate themselves.

He said: "Two people in love have a glow and a presence more powerful than anything else, and I wanted that to be the subject of the picture."