13/03/2017 1:29 PM AEDT | Updated 13/03/2017 2:47 PM AEDT

Princess Diana's Secret Lover Denies Being Prince Harry's Father

'It's worse for him...poor chap.'

Sunday Night
James Hewitt speaks out, 20 years following Princess Diana's death.

It is a rumour that has followed him for almost thirty years.

On Channel Seven's 'Sunday Night', Princess Diana's secret lover and former military officer James Hewitt looked down the barrel of the camera and addressed it directly.

"Are you Harry's father?" asked host Melissa Doyle.

"No, I'm not," Hewitt said.

The former officer, who served in the Queen's Life Guard regiment, first met Diana in 1986 when was employed to conduct her horse riding lessons.

He appeared on 'Sunday Night's exclusive feature that saw Melissa Doyle travel to the United Kingdom to commemorate twenty years since Princess Diana's death.

I think she was quite easy to fall in love with so really I think I can be forgiven for that.

Joining her former butler, Paul Burrell, her best friend Rosa Monckton and bodyguard Ken Wharfe, Hewitt was interviewed at his farm in Devon, in southwest England, where he spoke openly about his affair with the 'People's Princess'.