A week later multiple reports emerged about a rift between the two couple.
Including the accounts that Duchess Catherine being left "in tears" at Meghan Markle's wedding dress fitting...
Now it would appear the problem lies within the two brother.
Watch: Royal insiders dish on the feud between Kate and Meghan
The Daily Mail claims that Harry is angry that William wasn't “rolling out the red carpet” for Meghan after their engagement news.
The report continues he believed his big brother “wasn’t doing enough” to welcome Meghan into the royal family.
Apparently Prince Charles was asked to step in, telling his eldest to “make more of an effort”.
Need not worry too much.
Another pal close to the brothers advised, “They are still incredibly close, closer than most siblings, but now Harry has married and is about to become a father, so it’s a good time for him to be planning his own future. There is no acrimony.”
Meanwhile, there might be something in the sister-in-laws not quite seeing eye-to-eye.
Kate, 36, and Meghan, 37, have made several joint appearances as part of the Royal Fab Four - plus their iconic venture to Wimbledon for a girls’ day.
But it is said they’re “very different women, despite their similar circumstances,” a source told The Daily Telegraph. “Meghan is an extrovert, whereas Kate is quite shy.”
Watch: Catherine cries at Meghan's wedding dress fitting