Queen Elizabeth, Prince Philip, President Ronald Reagan, and first lady Nancy Reagan in 1982. Tim Graham Photo Library via Getty Images
Reagan was the first US president to stay overnight at Windsor Castle. In his memoir, An American Life, he called the visit a fairytale trip.
The Queen wore light blue again when President George H.W. Bush and first lady Barbara Bush paid a visit in 1989. Prince Philip, first lady Barbara Bush, President George Bush, and Queen Elizabeth in 1989. JONATHAN UTZ/AFP via Getty Images
Years later, in 1993, the Queen awarded Bush with an honorary Knight Grand Cross.
She wore a red skirt suit with black detailing to tea with the Clintons at Buckingham Palace in 2000.