The Prince has sat down with Tom Bradby for an exclusive interview (Picture: PA)

Prince Harry is set to unveil never heard before Royal secrets in a tell-all interview tonight.

The Duke has sat down with Tom Bradby to give a full one-hour interview ahead of his book release tomorrow.

The Prince’s autobiography is set to hit the shelves in UK bookstores tomorrow.

His interview with former Royal reporter Mr Bradby is said to include a number of ‘truth bombs’ that could shock the monarchy.

The Duke of Sussex said he wrote his tell-all book Spare because of ‘38 years…of spin and distortion’.

Asked why he had written the memoir, he told Tom Bradby on ITV that ‘38 years…38 years of having my story told by so many different people with intentional spin and distortion felt like a good time to own my story and be able to tell it for myself.

‘You know, I don’t, I don’t think that if I was still part of the institution that I would have been given this chance to.

‘So, I’m actually really grateful that I’ve had the opportunity to tell my story, because it’s my story to tell.’

Following a 20 year friendship with the prince, the host of ITV’s News at 10 has been at the forefront of some of the royal’s biggest landmarks – including engagements, weddings and funerals.

Harry is expected to unleash ‘truth bombs’ in the new interview (Picture: ITV)

The pair sat down in California for the interview (Picture: ITV/ Shutterstock)

His autobiography is due to be released tomorrow (Picture: Penguin Random House / Avalon)

They are also set to discuss his relationship with his brother (Picture: ITV/Shutterstock)

In teaser clips already released ahead of the interview he has previously spoken about his relationship with Prince William and the King, and said he ‘wants his brother and father back’

He has described his brother as his ‘arch nemesis’ in other clips.

It is believed that he is going to speak about his relationship with the family, while also going through extracts from his forthcoming book.

Harry, 38, is also thought to speak in depth about his mother, and the fateful night that she died in 1997.

Other parts of the interview could include the Prince talking about his reasons for himself and his wife Meghan leaving the UK to start a new life in America.

The interview is set to air at 9pm on ITV.

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The Prince has sat down with Tom Bradby in a highly-anticipated interview set to unveil Royal secrets.