They are, perhaps, the four most famous kids in the world.
Or, to put it more accurately, they were, most definitely, the four most famous babies on earth at the time of their birth.
Five years ago, Kate Middleton and Prince William welcomed Prince George into the world. He was followed two years later by sister Charlotte and then two years after that by brother Louis.
Fast forward about 12 months as Louis made his grand entrance and Meghan Markle and Prince Harry joined the human-creating fray by introducing everyone to son Archie.
Well, Archie Harrison Mountbatten-Windsor to be exact.
On the heels of Archie's first-ever photos, we thought it would be fun to take a look back and compare ALL first-ever photos of all four Royal Children.
They're all precious and all adorable and all pretty much perfect -- but who made the most impressive debut?
Scroll down to decide for yourself!
Daddy's Little Boy
Prince Harry has his hands full here with his son. It must feel amazing for him to even read that sentence.
Here he is, folks! Meghan Markle and Prince Harry have debuted their newborn. He is simply perfect.
Shhh, the young man who is seventh in line to the British throne appears to be sleeping in this adorable photo.
A New Royal Trio
Meghan and Harry share a laugh here while standing over and cradling the only thing that now matters: Their son.
Duke, Duchess and Baby
We now know the tyke's name. Say hi to Archie everyone!
So Royally Awesome
Meghan Markle has endured a lot of criticism as a new member of the Royal Family. But this makes it all worthwhile, we bet.
Royal Baby #3!
He's here! A mere seven hours after giving birth, Kate Middleton holds her brand new son cozy in her arms, while flanked by Prince Williams.
Kate Middleton and Louis
How incredibly sweet is this!?!??!?!? Look at Kate Middleton holding her son, Louis, in her arms. We love it.
Cradling Louis Arthur
Such a cute couple. Such a cute baby. Such a cute photo of William, Kate and little Louis Arthur.
With Her Little Prince
Say hi to the new little prince. He is being held and cuddled in this photo by his beloved mother.
Checking in on Kate
"Are you okay, honey? Are you holding up alright? Do you want to go inside and actually get some rest after giving birth to a human?"
Oh, Royal Baby
Can you believe Kate Middleton had this baby just seven hours before she debuted him for the public? She's a superhero.
And Baby Makes Three
We're so very happy for William and Kate. We can't wait to get to know their son well as the years go on.
It's the snapshot we've all been waiting for, as William, Kate and baby number-three greet their fans in London.
Kate and Her Kid
Does it get any more precious than this?!? The Royal Family has given us this glimpse of Kate Middleton cradling her son.
The Royal Welcome
What is there to even say? The looks on their faces say it all.
Kate and William have one special reason to look this happy in this photo. And that reason is resting in his mom's arms.
William and Kate wave to an adoring throng of fans in this special picture, which features their third kid and second son.
What a blessing, right? For both Kate Middleton and Prince William and the entire world at large.
The royal baby is here, and she's a princess! Kate Middleton and Prince William welcomed and introduced their second child on May 2, 2015.
The First Daughter!
A beaming Kate Middleton, Prince William and their royal baby daughter make their public debut May 2, 2015. She's a cutie! (So is the baby)
Parents of the Princess
Kate Middleton, Prince William and the new addition to their family smile and greet well-wishers outside the hospital.
The royal baby is here! Kate Middleton and Prince William welcomed and introduced their second child on May 2, 2015 ... and it's a girl!
The first photo of the Royal Baby! See! There he is, HRH the Prince of Cambridge!
The Debut Baby
The first photo of the Royal Baby with Kate Middleton! OMG they are so cute!
Such Proud Parents
Kate Middleton and Prince William with their baby boy. Love that adorable little royal family!
A lighter moment with Kate Middleton and Prince William holding the Royal Baby during its public debut.
A sweet photo of Prince William and his baby. Simply beautiful.
We End on a GIF