Harry says in the video, adding that the brothers didn't talk enough about Princess Diana's death when they were young, but have discussed it more as adults-especially now, with this campaign.
"Having asked others to start conversations on mental health with their friends and families, they wanted to show that they are taking part as well", the spokesperson said. "I just didn't know what was wrong with me", he said.
"But even Harry and I over the years have not talked enough about our mother".
"It made me very nervous at first - me waking up every morning and feeling sad and going onstage is something that's very hard to describe", she said. "It ain't going to bring her back.' And when you start thinking like that, it can be really damaging".
For quite some time, the royal trio have been working with Heads Together to bring awareness to the organization's mental health campaign. But Prince Harry goes on to say that he had been wrong and that this attitude had only hindered his ability to cope with what had happened.
This signifies the message that people like Lady gaga and Prince William should talk, and be open about mental illness and PTSD.
"The pressures on children nowadays, are more than they ever were for us", said Prince William. Helping Greg to announce the Top 40 were the Duke and Duchess of Cambridge, William and Kate.
The prince was 12 at the time of his mother's death, which came about a year after Diana's ugly divorce from Prince Charles.
They didn't seem offended by getting splashed, as it was all for a good cause - supporting those with mental health issues.
The Duke and Duchess of Cambridge and Prince Harry joined Heads Together over the weekend to make the 2017 London Marathon the Mental Health Marathon.
At least 700 runners have dedicated their involvement in Sunday's marathon, as well as the total donations they will accrue, toward the Heads Together campaign. "But also, how you've got amazingly close".
Middleton speaks about motherhood after giving birth to her child George, saying that no matter how many books you read, nothing can really prepare you for it.
One thus discovers the royal trio installed in the gardens of the palace of Kensington to engage on subjects very personal, forgetting nearly the presence of the cameras.