Prince William & Kate Middleton Get Hands Dirty at Tree Planting Ceremony (PHOTOS)

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A cheerful tree planting ceremony paused for a somber moment as Prince William and Kate Middleton honored Princess Diana’s memory.

After the Duke and Duchess of Cambridge shoveled dirt on the hemlock during the official ceremony at Rideau Hall in Ottawa, Canada, they walked to a tree close by that was planted by Prince Charles and the late Princess Di, who would be 50 this month. They stood quiet for a few moments before greeting a crowd of 1,500 people at the Canadian War Museum.

As ever, Kate looked perfectly presentable in a gray Catherine Walker dress, which is sure to sell out after her appearance. During her Canadian trip, almost every item of clothing — including the purses she carried — have sold out at retailers withing the day.