The author, who is publicizing her latest tome “Meghan and Harry: The Real Story” made the shocking claim while speaking to new! magazine (via the Daily Mail).

“In my opinion, Harry is a much less intelligent character than Meghan is,” she said. “And I think he’s so desperate to please her and go along with whatever she says, no matter how ill-conceived it is. He is that besotted with her.”

Campbell, 70, also claimed the couple has “a very strong relationship” but Meghan is the dominant partner because Harry is “besotted with her.”

The red-headed royal, 35, struggled academically as a youngster. He spent an extra year at Ludgrove to improve his grades before applying to Eton.

He graduated from Eton College with two A- Levels, a B in art and a D in geography. One of his former teachers alleged that he was a “weak student” and that staff at the prestigious school had conspired to help him cheat on exams.

A tribunal found that “the prince had received help in preparing his A-level ‘expressive’ project, which he needed to pass in order to attend Sandhurst but didn’t rule that it was cheating.”

Both Eton and the royal family strongly denied the cheating claims.

Unlike his brother William, Harry did not attend college but did complete 10 months of officer commissioning training at Royal Military Academy Sandhurst.

Markle, 38, attended Northwestern University graduating with a double degree in theater and international relations. She also speaks fluent Spanish.

The couple shocked the world earlier this year when they bowed out of royal duties and moved to Canada before eventually moving to Markle’s hometown of Los Angeles. They have been holed up in a sumptuous mansion owned by Tyler Perry with their 1-year-old son Archie.