Kate Middleton Welcomes Baby No. 3! Take This Quiz And We'll Tell You Your Royal Baby Name

Let me be your ruler, you can call me Queen B. 🎶👑

As is tradition, here is the official framed birth notice on display at Buckingham Palace.

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Prince George and Princess Charlotte's newborn baby brother is... Prince Louis!

His full name is Louis Arthur Charles. "The baby will be known as His Royal Highness Prince Louis of Cambridge," according to a statement from Kensington Palace.

Here's Prince Louis making his royal debut earlier this week.

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The Duchess of Cambridge (aka Kate Middleton) delivered her third child on Monday, April 23. He weighed in at 8lbs 7oz. Both mommy and son are reportedly doing well.

Kate and Prince William are already parents to a four-year-old son, Prince George of Cambridge, and a two-year-old daughter, Princess Charlotte of Cambridge.

This family is royally adorable. 🤗

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These kids have some fancy titles and sophisticated names for such little cuties.

Now that we officially know the name of Prince William and Kate's newest bundle of joy, let's find out what your royal name would be.

Fill in the missing lyric from Lorde's song "Royals."

What is this interesting headpiece called?

What is your favorite piece of pop culture about the British monarchy?

What would you wear to a royal wedding?

What is your ideal day job?

Your name would be... Prince Henry Hardinge, Earl of Wessex!

Your name would be... Prince Henry Hardinge, Earl of Wessex!

Your name would be... Lady Anne of York!

Your name would be... Lady Anne of York!

Your royal name would be... Sir Arthur Charles Cambridge-Windsor, Viscount Falmouth!

Your royal name would be... Sir Arthur Charles Cambridge-Windsor, Viscount Falmouth!

Take the quiz below to see what your name would be... if you were a member of the royal family.

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Fill in the missing lyric from Lorde's song "Royals."