The Prince Of Wales And The Duchess Of Cornwall Visit Washington, DC - Day 3 [Getty Images]

WASHINGTON, DC - MARCH 19: Camilla, Duchess of Cornwall and Prince Charles, Prince of Wales smile as they visit Lincoln's Cottage on the third day of a visit to the United States on March 19, 2015 in Washington, DC. The Prince and Duchess are in Washington as part of a four day visit to the United States. (Photo by Chris Jackson/Getty Images)

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