Here are some highlights from their relationship. Watch the video above for more.
Summer 2016: The Duke and Duchess of Cambridge reportedly met through friends.
November 2016: Prince Harry confirmed their relationship in a statement regarding Meghan's unfair treatment by the press.
November 2017: The royal family announced the couple's engagement.
May 19, 2018: Prince Harry and Meghan Markle married in a ceremony at Windsor Castle, soon after taking on the titles of duke and duchess.
PHOTOS: Prince Harry and Meghan Markle's royal wedding
October 12, 2018: Rumors swirl after Meghan does not remove her coat at the wedding of Princess Eugenie, with many saying she was hiding her stomach.
October 15, 2018: The couple announced they are expecting their first child in the spring.
Their Royal Highnesses The Duke and Duchess of Sussex are very pleased to announce that The Duchess of Sussex is expecting a baby in the Spring of 2019. pic.twitter.com/Ut9C0RagLk— Kensington Palace (@KensingtonRoyal) October 15, 2018
October 16, 2018: The couple begins their two-week tour of Australia and other countries.