Princess Diana was buried on the Althorp estate where her brother, Charles, the 9th Earl Spencer lives.
The fifth-in-line to the British throne’s visit with the former Suits actress Meghan, 36, came in November just days before he proposed, according to reports.
Harry, 33, wanted Meghan to have the opportunity to “speak” to Diana while he himself “quietly asked for her blessing” to marry his American love, according to Daily Star Online.
They also plan to return to the grave to spend more time with Diana ahead of their wedding on May 19.
A source told the publication: “Harry has already taken Meghan to Althorp to see his mum, but they will go back before the big day.
“Harry wanted to take Meghan to see and speak to her (Diana)… it was very personal for Harry. I think he quietly asked his mum for her blessing to marry Meghan, too.”
Kate and Will look so loved up as they pose for their official shots [PA]
Prince Harry was just 12-years-old when his mother was killed in Paris following a horror car crash in 1997 – she was 36.
He and his older brother Prince William, who was 15 at the time, walked behind her coffin as the funeral procession made its way through London.
Last year marked the 20th anniversary of Princess Diana’s death. Reflecting on her passing during a special interview, the red-haired royal confessed that it had left a profound effect on him.
After years of mentally shutting out the pain and suffering panic attacks, he finally decided to seek counselling when he was 28.
He told The Telegraph: “I didn’t know what was wrong with me. [I was] very close to a complete breakdown on numerous occasions. From an emotional side, I was like ‘right, don’t ever let your emotions be part of anything.’ So, I was a typical sort of 20, 25, 28-year-old running around going ‘life is great, or life is fine,’”
Adding: ”Then I started to have a few conversations and then, all of a sudden, all of this grief that I’d never processed came to the forefront. I was like, ‘there’s actually a lot of stuff here I need to deal with.'”