The couple, who dazzled in the formal surroundings at St. James's Palace as they announced their news in London Tuesday, enjoyed their first day as bride- and groom-to-be "on cloud nine enjoying the happy moment," before going home to Wales, a spokesman says.
As the couple, both 28, met with aides at the palace to start the process of setting a date, speculation focused on an early weekend in July – the same month that William's parents, Prince Charles and Princess Diana, married in 1981.
And there is likely to be a straight choice between St. Paul's Cathedral, where his parents wed, or Westminster Abbey. But, as William admits, he likes to surprise people and may have another choice up his sleeve. Another option for the search and rescue pilot is the Royal Air Force church in London, St. Clement Danes.
Middleton, who will be known formally as Catherine, is said by palace insiders to be "winding down" her work at Party Pieces, the online store run by her parents, Michael and Carole. One major decision for her will be to pick a designer for her wedding dress.
For William, the choice is simple: As a serving officer in the Royal Air Force, he will wear military dress.
"It is very much their day and will reflect their wishes," an aide says of the wedding, adding that everything is on the table for discussion.
"It will not be a full state occasion but clearly there will be a number of formal and ceremonial elements. This will very much be a collaboration between the Lord Chamberlain's office [at Buckingham Palace] their household and other authorities."