Kate's Pregnant: Stars React to Royal Baby News

Celebrities react to news that Catherine, Duchess of Cambridge is pregnant. Getty Images

The Duchess of Cambridge is pregnant. Prince William has an heir (third in line to the throne, as it happens). Yes, a royal baby is on the way. Give or take six months.

Oh, Christmas came early, all right.

Wardrobe Watch: Catherine, Duchess of Cambridge

And if you think the world's media is going overboard with their enthusiasm for this momentous babymaking occasion, well, they've got nothing on Hollywood, because almost as soon as St. James's Palace announced that the duke and duchess were expecting their first child, Twitter exploded with well-wishes for the happy couple. (The countdown is already on for a royal baby parody account to pop up, and...oh, phew. We knew you wouldn't let us down, Internet.)

Kate is pregnant! Get all the deets on the royal baby

2013 Celeb Baby Boom

Herewith, a sampling of the celebrity baby congratulations for Will and Kate:

Prime Minister David Cameron: I'm delighted by the news that the Duke and Duchess of Cambridge are expecting a baby. They will make wonderful parents.

Kim Kardashian: Aww so cute! Congrats!!!

Khloe Kardashian Odom: Congratulations to the Duke and Duchess of Cambridge!! A royal baby!!! :) awwww so sweet

Check out all the signs that a royal baby was on the way

Brooklyn Decker: A ROYAL BABY

Ivanka Trump: A royal baby is on the way for #KateMiddleton and Prince William! lovely! #royalbaby

Damon Lindelof: "KATE MIDDLETON'S UNBORN CHILD SHALL SAVE US FROM THE FISCAL CLIFF!!!" -- My Cardboard Sign Today

Check out Kate Middleton's last public appearance before the baby announcement

Piers Morgan: Congratulations to every magazine editor for calling Kate Middleton's pregnancy - especially those who did covers on it 11 months ago.

Josh Malina: I hope it gets Kate's hair.

Estelle: Beautiful. Congrats will and Kate.

Cheryl Cole: I'm sooooooo excited that we're having a royal baby!!!! Congratulations to Kate and Wills!!!!!!

Practice makes perfect? Kate Middleton meets the cutest kids!