This comes after Buckingham Palace confirmed that Meghan won't be attending King Charles' coronation, which made this her first appearance since the announcement.
During a TED Talks event, Meghan praised Harriman's photography skills, saying that "His lens has photographed everything from events that have changed the world, invisible moments we all desperately needed to see, along with some of the planet's most recognizable faces."
She also called Harriman her "dear friend," and said that she had experienced his talent firsthand as he's captured many meaningful milestones for her and her family.
Harriman, who had previously shared Angelina Jolie's stunning picture and took some of the most circulated photos of the Black Lives Matter movement, thanked Meghan for her kind words of support.
He was reportedly a guest at Lili's Frogmore Cottage party and later appeared in the Duke and Duchess of Sussex's docuseries "Harry & Meghan".
The video comes just two weeks before King Charles III's coronation, where Prince Harry will attend the historic event alone as Meghan has decided to stay with their children at their Montecito mansion. It's expected that they will celebrate their son Prince Archie's fourth birthday on the same day (May 6).