Prince Harry and the Duke and Duchess of Cambridge will cheer on the runners at this year's London Marathon.

Prince Harry

Prince Harry

The 32-year-old royal announced he would join his brother and his sister-in-law, with whom he founded the mental health campaign Heads Together, on the sidelines of the race on April 23 in the capital in a bid to raise awareness about mental health.

The flame-haired hunk made the announcement in a video posted online in which he said: "You've been training for months and the start line to the 2017 Virgin Money London Marathon is finally within sight. I'm sure it will be one of the most rewarding experiences of your life.

"William, Katherine and I will be there to cheer you all on. We're really excited that Head's Together is the chosen charity for this year's marathon. We want to use this moment to end the stigma that stops people talking and change the conversation about mental health for good.You can make it the mental health marathon. We know that many of you will be running for some incredible charities because you have been directly affected by life-changing issues. You'll recognise the emotional impact these can have and how talking about it openly can help. We all have mental health just as we all have physical health, and you can all play your part in the biggest movement in mental health. Whatever cause you are running for, wear your vest with pride and please wear your Heads Together headband. When we work together we can achieve great things. Good luck, see you at the finish line."

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