Prince Louis Joins William & Kate, Siblings in First Public Royal Easter

Prince Louis has crossed a Royal threshold — going to church on Easter with his family … something his older siblings didn’t do publicly until just last year, so he’s got ’em beat.

The youngest child of Prince William and Kate Middleton — who’s 4, but turning 5 later this month — was seen out with the whole brood Sunday as the Wales crew made their way to mass to celebrate the holy day … with everyone color coordinating in crisp, blue outfits.

Louis looked well-behaved as he held onto his mom and dads’ hands while coming to and leaving St. George’s Chapel. He even shook hands with the priest … which was pretty cute to see.

It’s interesting that he made his big debut at such a young age — you see, Prince George and Princess Charlotte only got out there for the first time last year at ages 8 and 6, respectively. Despite PL’s history of acting out, it would seem Will and Kate trusted him.

From the looks of it, Lou put on his big-boy pants shorts and kept it together through what is undoubtedly a boring holiday for little ones … at least when an egg hunt’s not in play.