However the young prince's his great-grandmother, Queen Elizabeth, was not present.
Other mums related to the superstar mother's pain.
"It's not the end of the world if someone doesn't love you anymore - it's only the end of the world, if you don't love you anymore."
The co-host of The Project shared the good news via her Instagram account on Thursday.
You will not be able to resist taking a look at how beautifully all those adorable babies grew up.
Mums everywhere sympathise.
Little Leonore stole the show at her sister's christening, that's for sure!
A long-awaited glimpse of Rumi and Sir.
"I wanted to be perfect for her."
He sure is sweet!
Model Chrissy Teigen and singer John Legend have announced the arrival of their baby boy, who comes ahead of schedule.