No doubt pleased to be enjoying a little less pressure as a guest rather than the bride, Meghan stunned in a navy blue coat dress for the occasion, and Harry looked handsome in his classic suit.
The couple didn't waste any time getting inside the church, presumably not wanting to steal the spotlight from the bride on her big day.
Meghan and Harry are expected to attend the ceremony inside St George's Chapel alongside royal family members including Queen Elizabeth, Prince William, Kate Middleton and their children, Prince George and Charlotte who are part of the bridal party.
Harry and Meghan will then attend the lunch reception and evening event on Friday, alongside their family and friends.
However, Princess Eugenie and Jack Brooksbank have reportedly planned a second, "festival-inspired" party on Saturday, which the Duke and Duchess will likely have to skip due to their royal tour commencing on Monday the 15th.
As for this royal festival, "There will be dodgems and funfair rides, coconut shies, lots of food stalls, loads of cocktails, Bloody Marys for the hangovers and a festival vibe," a source told The Times.
Queen Elizabeth in a dodgem car? Now that's something we'd pay to see.