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Mario Testino has spilled the beans on that photo session for Prince William and Kate Middleton's official engagement portrait. The famous fashion photographer has told US Vogue what went on during the shoot, saying "The very best pictures are the most relaxed. So a lot of fussing around technically can completely break the spell, and everyone freezes up with nerves. Even someone as photographed as the Royal Family needs to feel completely comfortable if they are to look their best." he said.

Testino arrived at St James' Palace early on the day of the shoot, where he proceeded to help Middleton pick out that white dress by Reiss. He also brought along a CD of songs by French singer, Dalida, which he played for Princess Diana when he photographed her.

Testino had met Middleton before, at the exhibition of his Princess Diana portraits at Kensington Palace in 2005. Of photographing her, Testino says: "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."

"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."

As for what he wanted to capture in the image: "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."

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