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Kate Middleton and Prince William Welcome Royal Baby Boy, Stars Tweet Congratulations

Kate Middleton, Prince William Chris Jackson/Getty Images

Kate Middleton and Prince William have welcomed a royal baby boy!

The Duchess of Cambridge gave birth to the couple's first child at London's St. Mary's hospital at 4:24 p.m. local time today, the palace confirms, and celebrities are wasting no time weighing in on Twitter to the big news.

Here's what stars saying about the birth of the royal baby.

Ellen DeGeneres "It's a boy! So happy for my cousin Kate and the future King of England!"

Kelly Osbourne "#GodBlessOurFutureKing very proud to be british right now!"

NEWS: Kate Middleton gives birth to a baby boy. All the details!

Kim Zolciak: "Congratulations to William & Kate on the arrival of a Prince. #RoyalBaby."

Jeff Ross: "Breaking News: Kate Middleton has given birth to an 8 pound 6 ounce baby brat."

Bethenny Frankel "Congratulations to the Royal Family on their new baby boy!"

Melissa Gilbert "Welcome royal baby boy!!!" 

Josh Groban: "Alright I'm going back to watching the 24/7 online royal baby cam," and, "I know it's a boy, I'm watching it on the dang web cam. It's gurgling."

PHOTOS: Twitter captures the massive crowd outside Kate Middleton's hospital

Ramona Singer "A Prince! How exciting! #RoyalBaby #itsaboy."

Jack Osbourne "EPIC!!!! a new prince was born. its like real life Game of Thrones #royalbaby," and, "Wouldnt it be great if England had 30 days of games to celebrate the birth! dueling, jowsting, a flagon of mead...#GameOfThrones #RoyalBaby."

NeNe Leakes "Royal baby boy!"

Joel McHale "A lady had a baby."

Kirstie Alley "I like the name William Spencer...a perfectly lovely name for the Royal baby."

Louise Roe: "Congrats to William and Kate on the birth of their baby BOY! #RoyalBaby."

Andrew Zimmern: "#royalbaby supposedly will be named Knot. Kardashian family devastated."

PICS: See Kate before she was famous

Melissa Joan Hart "Congratulations to the royal family on the new little Prince! Welcome to the world little man! #royalbaby."

Debi Mazar "Congrats 2 #RoyalFamily!I thought boy by the way she carried!Princess Diana is watching from above,smiling down I bet!beautiful moment."

Colin Hanks "'@annkpowers: Name that #RoyalBaby RINGO #rattleyourjewelry' LOVE THIS REFERENCE!"

Cara Delevingne "The royal baby should be called George!! (If i get it right I win a pint)."

Holly Robinson Peete: "#RoyalBabyBoy Congrats to William & Kate & whoever the royal nappy changer is! (is it weird me n hubby used to LOVE changing poopy diapers?)"

Crystal Hefner: "Congratulations to William & Kate on the arrival of a Prince. #RoyalBaby."

Chris Hardwick: "According to twitter, right now I'm supposed to be hosting a show about the royal baby called "After Birth". (They should name him "Carl")."

Jill Zarin "Congratulations to Princess Kate...a BOY!!! It's a boy!!! So happy for them. They are such a beautiful family."

Chrissy Teigen "Poor Harry. A tiny baby has more power than him. Unacceptable."

NEWS: Kate goes into labor—get all the scoop!

Joan Rivers "Congratulations to Kate & William on the birth of their baby boy! So relieved that his name won't include the words Ivy or Apple."

Kelly Ripa "It's a boy! Perhaps Anderson? Or Cooper? @andersoncooper @DevnaShukla."

William Shatner "So pleased to hear that William and Kate had a baby boy. Long live the future king. MBB."

Ellen Page "Woah people seem super excited for this new british band, the royal baby."

Hilaria Baldwin "Congratulations Will and Kate on the birth of your son! I wish you so much happiness and health!"

PHOTOS: Celebrate the birth of Kate Middleton's baby boy with memorabilia

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