Ingrid Seward, editor of Majesty magazine, made the controversial assertion. She was speaking at the launch of her new book ‘Prince Philip Revealed: A Man of his Century’.
Prior to meeting Harry, on a blind date in July 2016, Meghan was already an accomplished actress.
She was most famous for her role as Rachel Zane in the hit US legal drama Suits.
However her global profile rocketed after it became public she was dating Prince Harry in October 2016.
Ms Seward said: “It was a whirlwind courtship, it was pretty quick.
“Harry is totally mesmerised by her; he would follow her to the ends of the earth, that’s my feeling. He’s obsessed.
“He’s being dragged around like a royal performing seal.
“And Meghan has got to hang on to Harry because he’s her entrée – what is she otherwise, but a starlet?”
Referring to the couple’s relationship she added: “God Almighty, Meghan has really moved at the speed of lightning.”
READ MORE: ‘Nobody on the outside has the right to judge’ Meghan and Harry
They also signed a mega deal with Netflix to produce films, documentaries and children’s shows for the streaming giant.
Ms Seward asserted Harry is very responsive to Meghan’s wishes.
She said: “A really glistening white wedding isn’t right for someone who’s already done it once as Meghan has.
“She’s a very LA girl – all that ‘Oh Harry…’ and all that hands-clasped business of Meghan’s.
“Harry lives up to the redhead image of a hothead totally, he always has – he’s very sensitive.”
Since stepping down as a senior royal Meghan has become more outspoken about issues close to her heart.
On Friday she endorsed Social Media Kindness Day, which takes place next Monday.
She said: “For so many, social media plays a big part of their daily life.
“We have access to it at the end of our finger tips, so it ought to be a safter and kinder place for all.
“It saddens me that in today’s society Social Media Kindness Day is deemed necessary.
“But it absolutely is!”