Awkward conversations about wedding guest lists are a tale as old as time, and apparently, even Prince William and Kate Middleton weren't immune to the phenomenon. When the couple was planning their April 29,

On May 1, the Prince and Princess of Wales' office at Kensington Palace posted a mysterious new video to their social media accounts. "Happy May Day," Prince William and Princess Kate's team wrote below the 16-second clip with a flower emoji, referencing the first day of the month. "Coming soon…" it continued, plus a video camera icon.

Princess Kate’s cancer diagnosis last year made the Prince and Princess of Wales “prioritize family and each other over everything else,” a source tells Vanity Fair. Now, with their three kids in tow,