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LONDON (AP) _ Heather Mills said she isn't just marrying Paul McCartney for his money. If she were, she said, she would have found someone richer.

That would have been difficult _ an annual ranking of Britain's wealthiest put McCartney's personal fortune at $1 billion, making him the country's richest musician and the 36th richest Briton overall.

``He knows and I know why I'm with him,'' Mills, 36, told the British Broadcasting Corp. on Tuesday. ``If I was going to go out with anybody for their money, it would be with someone a lot richer.''

When an interviewer responded that few people were wealthier than the 59-year-old former Beatle, Mills said, ``There are a lot of people, believe me.''

The activist for land mine victims described her fiance as ``just a great guy.'' She said he pursued her for months before they became a couple. They got engaged in July and have kept their wedding plans a secret.

``He got hold of my number and eventually he said he wanted to help with my charity work,'' Mills said. ``Or so he said.''