From one royal couple to another!

President Barack Obama and First Lady Michelle Obama touched down in London on Tuesday -- just in time to meet with the brand-new Duke and Duchess of Cambridge!

PHOTOS: Look back on Kate and William's wedding day

Days after arriving home from their ten-day honeymoon in the Seychelles, Prince William, 28, and Kate, 29, happily greeted Barack, 49, and Michelle, 47, in Buckingham Palace.

Britain's royal couple were sporting golden tans, naturally, from their luxurious private-island retreat off the east coast of Africa, where they went scuba diving, hung out on the beach and enjoyed a private butler among many other amenities. Chatting with the First Lady, Duchess Kate particularly glowed in a tan, form-fitting dress.

PHOTOS: How Kate's wedding compared to Diana's

Upon their first arrival at the Palace Tuesday, the Obamas were greeted by Queen Elizabeth II and Prince Phillip, who gave them a private tour of the premises. In a rare honor, the President and First Lady were then given a 41-gun salute by Scots Guards in red jackets, who also played the Star-Spangled Banner. A longer 61-gun salute at the Tower of London was also heard throughout the city.

PHOTOS: Michelle wears McQueen, just like Kate!

America's first couple will reside for two nights a six-room suite -- last used by William and Kate on their wedding night.

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