Prince Louis was as cute as a button at his fancy royal christening

We defy you not to grin like a maniac...

The British royals were out in force for the royal christening of Prince Louis. It was the first time Kate, Prince William, Prince George, Princess Charlotte and Prince Louis were seen out as a family of five. And man, that family is just picture perfect.

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The little muffin looked like he slept throughout most of the proceeding as a beaming Kate Middleton carried him into the christening ceremony in the Chapel Royal at St. James Palace.

Water specially flown in from the River of Jordan is also likely to have been used — this being a royal tradition dating back to the baptism of Queen Victoria's first child in the 1900s. Fancy.

The bub was baptised by the Archbishop of Canterbury, Justin Welby, the head bishop in charge of the Church of England. He also reportedly baptised Meghan Markle ahead of her wedding to Prince Harry last month.

Speaking of Megs, she was making a solid case for olive green as she stepped out looking like, well, a chic olive.

Girl seems to be at a royal function every damn day.

Also in attendance were Louis' proud grandfather Prince Charles, his wife Duchess Camilla, and Auntie Pippa Middleton and James Matthews.

After the christening, guests were treated to a private tea service at Clarence House where they were served slices of William and Kate's wedding cake from 2011.

No word on whether it was the good sort of stale.