The pair arrived to St. George's Chapel in Windsor with several other members of the bridal party, including Harry's goddaughter Florence van Cutsem and page boy Jasper Dyer, who look confused yet seriously excited to step out of the vehicle and into the fanfare.
The young children of the Duke and Duchess of Cambridge reprised the roles they had at their Pippa Middleton's wedding to James Matthews last May, so they have already had practice walking up the aisle.
Here is an even closer look at the royal jewel, as seen on Princess Diana during a benefit dinner in Austrailia in 1996.
The other bridesmaids and page boys in the group of 10 were also under 10 years old.
What most people didn't notice, however, was the royal raspberry Princess Charlotte gave the cameras and crowd outside of St. George's Chapel, in Windsor.
Keyless cars have a unsafe downside that has killed dozens of people
But many older vehicles have not been retrofitted to reduce the hazard, despite the modest expense of doing so. The risk identified initially was theft, because drivers might leave the key fob in the vehicle by accident.
Britain's Princess Charlotte holds the hand of her mother Kate, Duchess of Cambridge.
Charlotte wore a bridesmaids dress in ivory silk Radzimir, and is high-waisted with short puff sleeves and hand finished with a double silk ribbon detail tied at the back in a bow. Many thought the red carpet brand would design her wedding gown, which was originally rumored to be heavily beaded, but instead, she chose simple Givenchy and Stella McCartney dresses.
Meanwhile the four page boys are wearing a miniature version of the Blues and Royals frockcoat.
Meghan's spring bouquet featured her favourite flowers, Forget-Me-Nots, amongst scented sweet peas and sprigs of myrtle. As a special memento, George has his initials embroidered in gold on his shoulder straps. "She has a very close-knit circle of friends and she didn't want to choose one over another", a spokesman from Kensington Palace told ET earlier this month.
Princess Charlotte reportedly pulled off her duty well.