The newlywed Duke and Duchess of Sussex joined the rest of their family to watch the parade, part of the Queen's birthday celebrations, in London on Saturday.
Harry and Meghan are following in the footsteps of Harry's parents in their first confirmed overseas tour.
Each time Britain's Royal Family throws a wedding or steps onto the Buckingham Palace balcony, each of their glib throwaway marks and casual exchanges are carefully decoded by these "experts" studying the corresponding footage at home.More news: United Nations seeks urgent ceasefire to stop UAE assault on Yemeni port
It's no secret that Queen Elizabeth puts new royals through their paces.
Later this week, the Duchess of Sussex will travel by train with the Queen to Northwest England to carry out a full day of engagements in Cheshire.
"The Queen knows the potential pitfalls of not giving [new members] a guiding hand", royals biographer Ingrid Seward told People.More news: ‘Trash Panda’ scaled a Minnesota skyscraper, and everyone loved it
The tour is not just a late honeymoon for Harry and Meghan. But despite being a groundbreaker, she apparently can't wear whatever she wants to wear.
Meghan would have no doubt received some expert advice over the "correct" way to curtsy, but Kate Middleton is likely to have shared some wise words of advice with Meghan over the royal gesture.
Meghan's well-versed in watching how she acts in public, having spent a big portion of her life in the spotlight during her acting career, but how will she be trained in royal etiquette?
There was no sign of six-week-old Prince Louis. Charlotte wore an adorable pair of pink sunglasses as she attempted handstands, ran around with her brother and cheered on dad.More news: Actor John Schneider released from jail in alimony dispute
During the afternoon, George created social media controversy by wielding a realistic toy gun which he appeared to point at other children.