"Happy May Day," the couple's team wrote below the video Kate Middleton and Prince William are teasing their next project. On May 1, the Prince and Princess of Wales' office at Kensington Palace posted a mysterious new video to their social media accounts.

While Princess Kate and Prince William have always marked the milestone in private, this year they're on two-day Scottish tour.

Blonde ambition. Kate Middleton debuted a bold, blonder hairdo Tuesday as she stepped out in Scotland on her and Prince William’s 14th wedding anniversary. The Princess of Wales’ sunkissed locks shined bright as she strode the streets of Tobermory on the Isle of Mull during the first day of her and William’s two-day tour of the Inner Hebrides (an archipelago off the west coast of mainland Scotland).