Gaga and William, who have both been involved in initiatives to combat stigma surrounding mental illness, had a frank cross-pond chat that was uploaded to Twitter very early this morning (April 18). There's a lot of shame attached with mental illness - you feel like something's wrong with you.
'In my life I go, "Oh my goodness, look at all these handsome, wonderful things that I have" and "I should be so happy,"' she shared. "And in my life I go, 'Oh my goodness, look at all these attractive, wonderful things that I have and I should be so happy'".
Prince William, 34, had a face time conversation with the popstar to discuss their charity work.
William added: "It's OK to have this conversation, it's really important to have this conversation and that you won't be judged". Prince William said: "It's so important to break open that fear and that taboo".
"I am a very big fan of what you've done with Heads Together and #OKto say.it reminded me how much my mental health changing change my life", Lady Gaga said.
He says this topic is especially close to his heart after his brother struggled silently with his mental health for more than 20 years after the death of their mother, Diana.
Prince William has said the shock of his mother's death "never left him", days after his brother Harry revealed he needed counselling after Princess Diana was killed in a vehicle crash in Paris.
She explained: "It was like saying, 'this is a part of me and that's OK'". It's the same as physical health.
The unlikely pair then vowed to meet up in October when Lady Gaga is in the United Kingdom for her Joanne world tour.
In the two-part documentary, William speaks to a group of 10 runners living with or affected by different mental health issues, as they prepare for the start of the marathon on Sunday. "I feel like we are not hiding anymore".
"Over the past year we have visited a number of schools together where we have been amazed listening to children talk about some quite hard subjects in a really clear and emotionally articulate way - something most adults would struggle with", he said.
Being just a young boy at the time, Harry is thought to have bottled up his grief for years.
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