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Decide on the length of the dress you want, preferably under the knee

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A classic: The French lace gown was embroidered with diamante and pearls and featured a circular train, while the wide neckline scooped just off her shoulders George and his British wife officially signed the marriage register at the palatial 14th century Ca' Farsetti palazzo the following Monday

While that was all squeal-worthy, the singer's super sexy Roberto Cavalli number probably also caused a few gasps on it's own