"The Queen would have looked at Meghan and thought, 'American divorcee, let's think again, Harry, '" he said, adding that the monarch's blessing was "vital" for the wedding to go ahead.
"It's a attractive couple, and it's great to see they found love and I just feel like it's going to grow because there's a generation who are going to discover the royal family in a slightly different way - I think this is a really good time for Meghan and for Harry". "She will realise the monarchy has been around 1000 years and she is not going to start throwing her weight around in the early days".
He told Express.co.uk: "I don't think any particular rules apply here and I don't think there will be the slightest chance that anyone would upstage Meghan at her own wedding".
It appears that there is more royal wedding drama brewing, thanks to Meghan Markle's family.
Meghan Markle smiles during a visit with Prince Harry to the Eikon Exhibition Centre in Lisburn, Northern Ireland.
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The royal expert said that unlike Kate and William, who had to invite members of states and politicians, Harry and Meghan have more freedom to choose who they want in the chapel's intimate setting.
The article on News.com claims that it's very likely Violet von Westenholz was the matchmaker who set up the blind date between Prince Harry and Meghan Markle. "If they're not it's going to be totally unbearable", said Greer.
Giant screens across Windsor will show the Royal Wedding and procession live, it was revealed today (Saturday).
Now, he said the public are thrilled to see the "gingerhaired roustabout" happy, and despite some underlying scepticism, he believes it's a "great love story that in 100 years' time people will be saying they were destined for each other". "It's really exciting to receive this invitation and be acknowledged in this way".
"The word I am getting from the palace is that Harry is absolutely besotted with her", he said.