Meghan Markle and Prince Harry could have been paid £775,000 for JP Morgan speech about being in therapy for seven years

: "Harry and Meghan will be the highest-paid speakers that exist on the corporate market.

"I would not be shocked if they earned in excess of $1million (£775,000). Over the year their earning power could be unlimited."

Ronn also reckons their expenses would have cost thousands for the event, which took place at the luxury 1 Hotel.

He said: "One would imagine they flew privately from Canada to Miami, had a hotel suite, and hair and make-up artist, which could cost $100,000 (£77,000) to $250,000 (£193,000) in expenses."

Sources at the event also revealed how Meghan, 38, and Harry had a hefty security entourage in tow.

Until now, the Sussexes have been "prohibited from earning any income in any form".

But experts think they will now join the world's top speakers by demanding hundreds of thousands of pounds for a single address at private events.

The Miami summmit was their first public appearance as a couple since quitting as senior royals last month.

Meghan introduced her husband at Thursday's event, where Harry discussed Megxit and the impact of losing Diana in a car crash in 1997.

A source told : "Harry spoke about mental health and how he has been in therapy for the past three years to try to overcome the trauma of losing his mother.

“He talked about how the events of his childhood affected him and that he has been talking to a mental health professional.

“Harry also touched on Megxit, saying while it has been very difficult on him and Meghan, he does not regret their decision to step down as senior royals because he wants to protect his family. He does not want Meghan and their son Archie to go through what he did as a child."

Earlier today, we revealed how Meghan and Harry plan to do "great philanthropic work" after leaving the Royal Family, according to their pal David Furnish.