Royal commentator Richard Fitzwilliams explains why the princes are being so open about their late mother.
The princess's sons will remain out of public sight in Balmoral on the anniversary.
Her life was lived in the spotlight, soundtracked by the click and whirr of a million cameras.
Duke of Cambidge isn't so keen on the idea of expanding their brood.
'December they can announce the engagement and they'd be free to marry next year,' says Darren McGrady.
The princes have a day of events to mark the 20th anniversary of their mother's death.
'She had quite a severe head injury but was still very much alive on the back seat,' the royal added.
The princes opened up in a BBC documentary to be screened.
Royal speaks to Mark Austin in Channel 4 documentary Wasting Away: The Truth About Anorexia.
Actor John Boyega revealed that the British royals make cameo appearances as stormtroopers in the next instalment in the sci-fi franchise.
But are selfies allowed?
Could this be why Prince Harry is head over heels?
Ant McPartlin has described his recovery from addiction to painkillers and alcohol.
Countess Spencer wasn't popular with her world famous stepdaughter.
British Royal Family warned not to consume particular food to avoid illness abroad.
Police and firefighters seen rushing to help 17-year-old cyclist sprayed with unknown noxious liquid.
The royal is said to have made the three-week holiday "incredibly romantic".
Viewers felt compelled to watch the documentary with many branding Prince Charles 'a bully'.
'There's just nobody to physically scream at' she told voice coach Peter Settelen.
Camilla Parker-Bowles was "raunchier" than Charles, according to the late Princess of Wales.
Diana: In Her Own Words reveals unseen tapes on Channel 4 on 6 August.
Having Kids wrote the bizarre open letter to the Duke and Duchess of Cambridge on 25 July.