William and Kate knew about some of their troubles with palace aides, but nothing to this extent."

Congratulations to Harry, Meghan and Archie."

Most were pleasantly surprised by the couple’s public show of support.

Prince William and Kate Middleton smiling

Another said, “The class on these people is outstanding.”

The Duke and Duchess of Cambridge posted the same message on Twitter, and it got similar responses.

One Twitter userwrote, “They always take the high road!”

Prince William and Kate Middleton walking

Anothersaid, “Class.

Pure and simple.”

One userchimed in with, “Nothing more beautiful than humility and dignity @KensingtonRoyal .

A true prince and princess x x”.

Another William and Kate fanwrote, “class & maturity level off the charts….

Many were just happy to join in on the celebration with plenty of congrats replies on Instagram and Twitter.

One usertweetedthe happy message, “Mazel tov to all!

Welcome to the world Lili!

Nothing like a baby to make us all smile!”