Kourtney Kardashian, Mason Disick

AKM Images / GSI Media

The Kardashian clan's teeny-tiny new addition is already a big star!

Kourtney Kardashian and Scott Disick welcomed daughter Penelope Scotland Disick on Sunday, and already she's making waves across the Twitterverse—just like the rest of her famous fam!

Friends and family took to Twitter to congratulate the proud parents—whose 2-year-old son, Mason, is no doubt ecstatic to now be a big brother—and to send their well-wishes.

"Welcome to the world, Penelope Scotland Disick!" wrote Kim Kardashian on her blog. "Kourtney gave birth to a beautiful baby daughter on Sunday and the whole family is so thrilled to finally meet her! She is absolutely perfect!"

The proud new aunt also copped to her big plans for her niece. "I am so excited to be an aunt again and can't wait to spoil little Penelope. I know Mason is going to be the best big brother in the whole world. Congratulations Kourtney and Scott. Xo."

"Such an amazing day!!!!!" tweeted Khloé Kardashian Odom, who had earlier gushed, "I love all of my brothers and sisters!!!!!! All you need is [love.]"

Khloé later took to her blog to continue the gushfest:

"I'm an auntie again!" she wrote. "As I'm sure you all know, my beautiful big sister gave birth yesterday to the most perfect baby girl you've EVER seen—Penelope Scotland Disick! The entire family is literally exploding with joy and have not stopped fawning over our new little girl. And Mason is already loving being a big brother! This is just such a special and happy time for my family. Thank you to Kourt and Scott for making such beautiful babies! LOL."

"Great day! ‪#babytime‬ ‪#PenelopeScotland," wrote Kendall Jenner.

"I'm so happy that @KourtneyKardash and @Scottdisick have had their baby x. Penelope Scotland Disick x," tweeted Kylie Jenner.

Proud new uncle Rob Kardashian was equally psyched: "Welcome to the world Penelope Scotland Disick!!!!"

Ellen DeGeneres, meanwhile, quipped, "@KourtneyKardash just had a baby! Kongratulations!"

"Congrats Kourt & Scott!!!" tweeted E! News' very own Giuliana Rancic.

Watch a special episode of Keeping Up With the Kardashians Monday at 9 p.m. on E!

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