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Catherine, Duchess of Cambridge arrives for her departure at Los Angeles International Airport on July 10, 2011 in Los Angeles, California. (Photo by John Shearer/WireImage)

Catherine, Duchess of Cambridge arrives for her departure at Los Angeles International Airport on July 10, 2011 in Los Angeles, California. (Photo by John Shearer/WireImage)

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SANTA BARBARA, CA - JULY 09: Catherine, Duchess of Cambridge arrives at the Foundation Polo Challenge held at the Santa Barbara Polo and Racquet Club on July 9, 2011 in Santa Barbara, California. (Photo by Steve Granitz/WireImage)

SANTA BARBARA, CA - JULY 09:  Catherine, Duchess of Cambridge arrives at the Foundation Polo Challenge held at the Santa Barbara Polo and Racquet Club on July 9, 2011 in Santa Barbara, California.  (Photo by Steve Granitz/WireImage)

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Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge arrive at LAX Airport on July 8, 2011 in Los Angeles, California.

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge arrive  at LAX Airport on July 8, 2011 in Los Angeles, California.