Will, Kate, and Harry advocate for mental health awareness -- and a quality blooper

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              Duke and Duchess of Cambridge and Prince Harry lead mental health charity campaign

Prince William, Princess Kate, and Prince Harry released a mental health initiative in a video Sunday. And the three filmed the video on what looks like a perfect spring day at Kensington Palace, or that could just be Kate's natural ethereal glow lighting up a dreary London afternoon. Hmm.

In the video, the three promoted their mental health campaign, "Heads Together" and announced that a team of mental health charities have been knighted by the Royal Foundation to run the 2017 Virgin Money London Marathon. The video, below, plays the upbeat "Turn Up" by The Heavy.

Photos from the day:

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Young royals launch mental health initiative
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Will, Kate, and Harry advocate for mental health awareness -- and a quality blooper
LONDON, ENGLAND - APRIL 21: The Duke and Duchess of Cambridge and Prince Harry are spearheading a new campaign called Heads Together in partnership with inspiring charities, which aims to change the national conversation on mental wellbeing. The campaign has the huge privilege of being the 2017 Virgin Money London Marathon Charity of the Year. At Kensington Palace on April 21, 2016 in London, England. (Photo by Nicky J Sims/Getty Images for Royal Foundation)
LONDON, ENGLAND - APRIL 21: The Duke and Duchess of Cambridge and Prince Harry are spearheading a new campaign called Heads Together in partnership with inspiring charities, which aims to change the national conversation on mental wellbeing. The campaign has the huge privilege of being the 2017 Virgin Money London Marathon Charity of the Year. At Kensington Palace on April 21, 2016 in London, England. (Photo by Nicky J Sims/Getty Images for Royal Foundation)
LONDON, ENGLAND - APRIL 21: The Duke and Duchess of Cambridge and Prince Harry are spearheading a new campaign called Heads Together in partnership with inspiring charities, which aims to change the national conversation on mental wellbeing. The campaign has the huge privilege of being the 2017 Virgin Money London Marathon Charity of the Year. At Kensington Palace on April 21, 2016 in London, England. (Photo by Nicky J Sims/Getty Images for Royal Foundation)
LONDON, ENGLAND - APRIL 21: The Duke and Duchess of Cambridge and Prince Harry are spearheading a new campaign called Heads Together in partnership with inspiring charities, which aims to change the national conversation on mental wellbeing. The campaign has the huge privilege of being the 2017 Virgin Money London Marathon Charity of the Year. At Kensington Palace on April 21, 2016 in London, England. (Photo by Nicky J Sims/Getty Images for Royal Foundation)
LONDON, ENGLAND - APRIL 21: The Duke and Duchess of Cambridge and Prince Harry are spearheading a new campaign called Heads Together in partnership with inspiring charities, which aims to change the national conversation on mental wellbeing. The campaign has the huge privilege of being the 2017 Virgin Money London Marathon Charity of the Year. At Kensington Palace on April 21, 2016 in London, England. (Photo by Nicky J Sims/Getty Images for Royal Foundation)
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Will, Kate, and Harry were serious in tone as they discussed an issue they've long championed: "Mental health is just as important as physical health," Kate says. Hurrah, please someone give that woman a megaphone.

But, even when delivering a somber message and you're a royal, it's okay to burst out into a laughing fit. "Let's do a serious one, guys, serious one." William says. Cue the giggling — even a prince should know "serious one" is basically an invitation to a laugh fest.

Oh Harry! Everyone's favorite red-haired Prince is also the ultimate third wheel:

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Prince Harry is the ultimate third wheel
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Will, Kate, and Harry advocate for mental health awareness -- and a quality blooper

Britain's Catherine, Duchess of Cambridge, Britain's Prince Harry and Britain's Prince William, Duke of Cambridge, wait to attend a Service of Commemoration for those who served in Afghanistan at St Paul's Cathedral in central London on March 13, 2015.

(Photo: KIRSTY WIGGLESWORTH/AFP/Getty Images)

Britain's Prince William, his wife Catherine, Duchess of Cambridge, and brother Prince Harry are pictured as they visit the Tower of London's 'Blood Swept Lands and Seas of Red' poppy installation, in central London, on August 5, 2014.

(Photo: JOHN STILLWELL/AFP/Getty Images)

Prince Harry and Prince William and Kate Middleton watch the action during the RBS Six Nations Championship match between England and Italy at Twickenham on February 10, 2007 in London, England.

(Photo by Richard Heathcote/Getty Images)

Prince George of Cambridge, Prince William, Duke of Cambridge Catherine, Duchess of Cambridge, Queen Elizabeth II and Prince Harry look on from the balcony during the annual Trooping The Colour ceremony at Horse Guards Parade on June 13, 2015 in London, England.

(Photo by Samir Hussein/WireImage)

Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge and Prince Harry watch riders at the finish line of Stage 1 of the Tour De France on July 5, 2014 in Harrogate, United Kingdom. Spectators and residents prepare themselves and gather on the streets as they get ready to watch Stage 1 of the Tour de France on July 5, 2014 in Harrogate, United Kingdom.

(Photo by Chris Jackson - WPA Pool/Getty Images)

Prince Harry, Prince William, Duke of Cambridge and Catherine; Duchess of Cambridge attend the England v Wales match during the Rugby World Cup 2015 on September 26, 2015 at Twickenham Stadium, London, United Kingdom.

(Photo by Karwai Tang/WireImage)

Prince Harry, Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge on the balcony during Trooping the Colour - Queen Elizabeth II's Birthday Parade, at The Royal Horseguards on June 14, 2014 in London, England.

(Photo by Chris Jackson/Getty Images)

Prince Harry, Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge share a joke on the set used to depict Diagon Alley in the Harry Potter Films during the Inauguration Of Warner Bros. Studios Leavesden on April 26, 2013 in London, England.

(Photo by Chris Jackson - WPA Pool/Getty Images)

Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge and Prince Harry attend Cycling on Day 6 of the London 2012 Olympic Games at the Velodrome on August 2, 2012 in London, England.

(Photo by Pascal Le Segretain/Getty Images)

Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge and Prince Harry applaud during the Show Jumping Eventing Equestrian on Day 4 of the London 2012 Olympic Games at Greenwich Park on July 31, 2012 in London, England.

(Photo by Pascal Le Segretain/Getty Images)

Prince William The Duke of Cambridge his brother Prince Harry  and his wife Catherine the Duchess of Cambridge interact with students during a visit to Bacon's College on July 26, 2012 in London.

(Photo: RICHARD POHLE/AFP/GettyImages)

Britain's Catherine, Duchess of Cambridge, Prince William and Prince Harry wave as they pass the Houses of Parliament aboard the Royal barge, 'Spirit of Chartwell' in central London, on June 3, 2012, during the Thames Diamond Jubilee Pageant.

(Photo: GLYN KIRK/AFP/GettyImages)

Prince Harry, Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge depart after the Royal wedding of Zara Phillips and Mike Tindall at Canongate Kirk on July 30, 2011 in Edinburgh, Scotland. 

(Photo by Jeff J Mitchell/Getty Images)

Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge and Prince Harry are seen during the Opening Ceremony of the London 2012 Olympic Games at the Olympic Stadium on July 27, 2012 in London, England.

(Photo by Pascal Le Segretain/Getty Images)

Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge and Prince Harry attend the Commonwealth Observance Day Service on March 14, 2016 in London, United Kingdom. 

(Photo by Samir Hussein/WireImage)

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