Prince William and Kate Middleton's never-before-seen wedding portrait was hiding in plain sight in Kensington Palace during 2017 video call with Lady Gaga

The Prince and Princess of Wales delighted royal fans when they released a never-before-seen wedding photo to mark their 13th anniversary this week.

But it turns out, the stunning black-and-white photo - which was taken by photographer Millie Pilkington - was hiding in plain sight long before that.

In August 2017, the Prince of Wales, 41, appeared in conversation with Lady Gaga as part of Heads Together's #oktosay film series.

The mental health organisation Heads Together was launched by the Prince and Princess of Wales and the Duke of Sussex in 2016.

In the video, Prince William is seen FaceTiming the pop star from his London office. 

The Prince and Princess of Wales released this previously never-before-seen portrait from their wedding to celebrate their 13th anniversary this week

After sharing footage of Kensington Palace and the Hollywood hills, the royal is shown sitting down at his desk and opening his laptop. 

On the desk, Prince William had four of framed portraits on display - including one of his beloved black labrador Wigeon, who passed away in 2010.

While the other two frames are largely blocked by William's laptop, the one placed furthest away houses the black-and-white portrait from the couple's wedding day.

The image shows Prince William wearing a black military uniform - having worn his Irish guards attire for the ceremony at Westminster Abbey. 

The heir to the throne is pictured with a hand on Kate's waist as she holds her floral bouquet in front of her inside Buckingham Palace.

During his conversation with Lady Gaga, the pair discussed the powerful films that have been released showing people from all walks of life discussing their mental health challenges under the #oktosay banner.

William pledged to ensure his children ‘grow up feeling able to talk about their emotions’. 

The Prince said for too long it has been taboo or weak to talk about personal issues. Elsewhere, he warned that while the traditional stiff upper lip has its place, it should not be at the expense of mental wellbeing. 

Prince William had four of framed portraits on display in the 2017 video - including one of his beloved black labrador Wigeon, who passed away in 2010

In August 2017, the Prince of Wales, 41, appeared in conversation with Lady Gaga as part of Heads Together's #oktosay film series

In May 2021, Lady Gaga opened up about her mental health battles on the Apple TV+ series The Me You Can't See, which Prince Harry also appeared on. 

During the series, Harry took aim at King Charles' parenting and said: 'My father used to say to me when I was younger, he used to say to both William and I, "Well it was like that for me so it's going to be like that for you".

'That doesn't make sense. Just because you suffered doesn't mean that your kids have to suffer, in fact quite the opposite.

'If you suffered, do everything you can to make sure that whatever negative experiences you had, that you can make it right for your kids.' 

Kate, who is undergoing chemotherapy for an undisclosed cancer, married future king Prince William at Westminster Abbey in April 2011 after eight years of dating.

Lady Gaga opened up about her mental health battles on the Apple TV+ series The Me You Can't See , which Prince Harry also appeared on (pictured)

Pictured: the Princess of Wales announced in an emotional video released in March 2023 that she has been diagnosed with cancer

The pair are facing their most difficult challenge so far amid the Princess's diagnosis, with Kate appealing for time, space and privacy as she continues her treatment.

The couple's official wedding photographer was Hugo Burnand but they also hired Ms Pilkington to be a private photographer. Ms Pilkington is also the photographer who took the picture of King Charles and Queen Camilla released last Friday. 

Last month, Kate praised her husband William for his support during 'an incredibly tough couple of months for our entire family' in an emotional message to the nation announcing her health news.

'Having William by my side is a great source of comfort and reassurance,' she said. 

Kate, 42, told how her diagnosis had come as a huge shock and that she and William 'have been doing everything we can to process and manage this privately for the sake of our young family'.