According to the publication Meghan is 'stewing' over the letter.
"Meghan would definitely be p*ssed," an insider reveals.
"She's confident in their marriage, but any woman would be unnerved by a letter of this nature," they continued.
"You'd hardly call Harry your everyday normal guy - he's literally the ultimate prince charming so there will be girls throwing themselves at him regardless of him being married!"
Carrie also pointed out that Meghan's diva like behaviour could also stand in her way.
"She's concerned about her public profile almost to an obsessive degree, which can drive Harry crazy... some say she puts her image above her marriage." the source added.