The now 38-year-old then went on to reveal that she found true happiness at age 33.
“And I say that so plainly because, well… it takes time. To be happy. To figure out how to be kind to yourself.”
“So for my birthday, here’s what I would like as a gift: I want you to be kind to yourself. I want you to challenge yourself.”
The news comes as Harry and Meghan celebrate their three-year anniversary as a couple, with some royal experts believing this will be a "very, very hard time" in their relationship.
According to Angela Mollard from New Idea Royals, the three-year-mark is a crucial time for a couple.
"I’ve been thinking about this a lot because three years is generally understood by relationship psychologists and counsellors to be the point where you move out of the limerence phase," said Mollard.
"Limerence is deeper than infatuation, but it’s the beginning of a relationship where it’s all butterflies and you laugh together all the time and you’re very amenable."
The royal commentator said that the Duke and Duchess of Sussex have reached the more realistic part of a relationship.
"Three years is around the stage where reality starts to kick in," said Mollard, and added that their son Archie also played a huge factor.
"Their relationship has moved very quickly by necessity – if she wanted to have a baby they had to move quickly."
Pick up your brand new copy of New Idea Royals, out now!