While we don't know the exact date Harry asked Meghan to officially be his lady, in November of last year Kensington Palace released a statement, quickly sending the world into a spin and confirming the relationship - even going as far as to say that the pair had been dating for a few months.
Whirlwind trips back and forth from London and Toronto ensued, with Markle quickly becoming a household name, and the most googled actress of 2016.
Harry took Meghan as his date to both his friend's wedding in Jamacia and to his sister-in-law Pippa Middleton's wedding to James Matthews, and the pair made their public debut as a couple at a polo match in May, though they still haven't been officially photographed together.
To celebrate their one-year anniversary, we take a look back at the timeline of Prince Harry and Meghan Markle's romance.
October 2016: British tabloids start reporting that Prince Harry is dating the Suits actress
November 2016: Kensington Palace release a statement confirming the relationship and asking press to give Markle and her family privacy.
December 2016: The first photos of the couple together are published as Prince Harry takes Meghan on a date night to the theatre.
January 2017: Meghan and Harry reportedly take their first holiday together: a trip to Norway to see the Northern Lights! The pair then spent time in London, staying at Kensington Palace. Meghan also met Kate Middleton and Princess Charlotte for the first time.
February 2017: Meghan and Harry are spotted holding hands in London after dinner at the exclusive Soho House, where they reportedly first met. Sources tell The Sun that the actress, who is currently on a break from filming Suits, has “virtually moved in” with Harry at his cottage in Kensington Palace.
March 2017: Meghan joins Harry as his date to a friend's wedding in Jamaica.
April 2017: Harry secretly flies to Toronto to spend Easter weekend with Meghan, according to photos obtained by E! News.
May 2017: Meghan and Harry make their first public appearance - and have their first public kiss! - at the annual Audi Polo Challenge in Ascot, England. Harry then drives to pick Meghan up for Pippa Middleton's wedding reception.
June 2017: Meghan expertly dodges a marriage question about Prince Harry while promoting Suits, choosing instead to smile at reporters.