Meghan Markle and Kate Middleton stepped out in contrasting colours for the American bride-to-be's first official engagement with the Queen on Monday.
It marked another milestone in Markle's path to joining the British monarch's family.
Harry and Markle were greeted with screams and shouts from some members of the public when they arrived at the venerable abbey.
Former Army intelligence officer Gerald Moor said Markle was likely taught to form a relationship with her kidnappers, the Daily Mail reported.
Meghan Markle has broken the often-antiquated royal protocol on numerous other occasions, albeit in more subtle ways, like rocking a messy bun or signing an autograph.
Meghan Markle is even closer to being an official royal now, and not just because she's truly embracing jaunty hats.
She also learned what to do if she is kidnapped, subjected to gunfire and intensely interrogated. The couple walked in behind Prince William and Catherine, passing a troupe of dancers performing outside the abbey.
"It would be a little unorthodox, but this is Prince Harry and he's certainly not shy about shaking things up".
To mark the release date, the network have shared the first photos of the lucky stars portraying Meghan and Harry.
After the service, William, Kate, Harry and Meghan met with schoolchildren who traveled from Belfast, Fyfe, Aberystwyth, Stoke-on-Trent, Alnmouth, Berwick-upon-tweed and York to attend the service.