Prince Harry was the first to say “I love you” to Meghan Markle — and the pair were immediately “obsessed” with each other after their first date, a new biography reveals.

The Duke and Duchess of Sussex felt “palpable attraction” after their first meet-up at London’s Dean Street Townhouse and raved about one another to their friends, according to the latest extract from the forthcoming book “Finding Freedom,” reported by the Daily Mail.

The biography, from authors Omid Scobie and Carolyn Durand, is due out next month and offers details on the Harry and Meghan’s early courtship as part of a larger look on how the couple decided to leave the royal family.

The two hit it off so well at the posh restaurant that they agreed to meet the very next day at the same place for a second date, the Mail reported.

Though the two didn’t kiss on their first encounter, Meghan giddily told friends the relationship “could have legs” while Harry left feeling as if he was in a “trance.”

The two were dating for only three months before Harry first confessed his love for Meghan, with the actress immediately responding back, “I love you, too!”

There was only a day between their second and third dates and — in six short weeks — Harry had made plans to whisk Meghan away on a trip to Botswana in southern Africa, according to the Mail.

“She came back smiling and just completely spellbound,” a friend describes in the book.

The head-over-heels couple kept arranging secret meetups, with Harry flying out to Toronto to visit Meghan, but he was eventually spotted in her neighborhood.

It wasn’t long after their relationship became known in her part of Canada that it was reported on in the British tabloids, bringing enormous attention to Meghan, with many attacking the couple with racial and classist epithets.

The Duke and Duchess have denied contributing to the biography but the couple has yet to dispute the early details distributed to promote the book.

“The Duke and Duchess of Sussex were not interviewed and did not contribute to Finding Freedom,” a spokesman for the couple told the Mail. “This book is based on the authors’ own experiences as members of the royal press corps and their own independent reporting.”