British designer Paul Costelloe trained as a design assistant at French luxury houses in Paris before joining British retailer Marks and Spencer in Milan Ben STANSALL

Irish-American fashion titan Paul Costelloe, who was the late Princess Diana's personal designer for over a decade, has died aged 80, his family said in a statement Saturday.

"We are deeply saddened to announce the passing of Paul Costelloe following a short illness," his family said, adding he was with his wife and seven children when he died in London.

The luxury womenswear designer was one of the most prominent Irish stylists and a regular on the opening day of London Fashion Week since the inception of the show in 1984.

Born in 1945 in Dublin, Costelloe trained as a design assistant at French luxury houses in Paris

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