They've been basking in that newlywed glow for months, but it seems that Harry and Meghan may have experienced a rare moment of discord on Eugenie's big day at St George's chapel.
As the pair waited for the ceremony to begin in St George's Chapel, the Duchess of Sussex seemed to be telling off her husband as a fidgeting Harry interrupted his wife as she chatted to Zara Tindall, The Daily Mail reports.
She fired a few words back at him and briefly gesticulates before turning away from him to continue speaking with Zara.
Lip readers' accounts of the conversation were inconclusive due to Harry turning his head to the side as he spoke to Meghan.
At one point the couple appeared to be discussing the chapel, the same one they were wed in, as Harry said: "Everything's different".
To which Meghan snapped back: "Yes, of course, that's the way."
She then appeared to gesture with her hands at how full the venue was as she said: "Fill up as much."
But Body language expert Judi James noted their strained poses and facial expressions.
She told Femail: "Harry appears to be anxious and fidgety when they sit in their pew seats, rocking about and fiddling with the tails of his jacket.
"Meghan looks calmer and politely sociable, chatting in a much more demure way to Zara in the seat in front.
"Harry starts to talk to her and she performs a subtle eye-dart to her left, a bit like a mother whose kid is trying to interrupt her grown up conversation.
"She turns to Harry and seems to have a slightly firmer conversation, raising her hands and then bringing them together and using a small head-baton gesture for emphasis.
"Meghan leans back towards Zara, resuming her polite social smile along with their conversation.
"Harry rubs his face, chews his lips and leans into the side of his seat like a child that has just been told to sit still."
The clip begins with Prince Harry shifting from side to side in his seat then fiddling with his trouser pockets.
After Meghan appears to tell him off he looks sheepish and flustered, tugging on his suit jacket.
Meanwhile, viewers were surprised that Prince William and Kate were showing more physical affection that normal.
Kate's hand could be seen resting underneath her husband's as they waited patiently for Princess Eugenie to arrive at the chapel.
Crowds of well-wishers gathered outside Windsor Castle to witness the 28-year-old's wedding to Jack Brooksbank, 30.
And scores of celebrities were seen filing into the chapel yesterday, where Prince Harry and Meghan wed just five months earlier.
Jimmy Carr, Liv Tyler and Naomi Campbell were among the famous faces who braved the gusty winds - which whipped off a few guests' hats.