Prince William, Princess Kate, and Prince Harry showed up to film a video in support of mental-health charity Heads Together... and their great spirits led to some lol moments!
As People magazine reports, the trio backed Heads Together in order to help "change the national conversation" on mental health. "Mental health is just as important as physical health," Kate says soberly in one shot.
But toward the end of the promotional video, the three keep giggling together, even as William mock-sternly directs that they "do a serious one" for the photographer. Even though it's a serious topic, their lighthearted approach will likely generate far more attention to the organization than a dry PSA.
Watch the charming video!