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Kardashian sisters excited about being aunts

Kim Kardashian, Kourtney Kardashian and Khloe Kardashian arrive at the grand opening of the Kardashian Khaos store on Dec. 15, 2011, in Las Vegas. Ethan Miller/Getty Images

(CBS News) Khloe and Kim Kardashian are both excited about being aunts again.

The two reached out on their blogs and on Twitter to express their excitement over their sister's new baby girl, Penelope Scotland Disick.

Read More: Kourtney Kardashian welcomes baby girl
Pictures: Kardashian sisters
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"I'm an auntie again!!!!!!!!! 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," wrote Khloe on her blog. "And Mason is already loving being a big brother! This is just such a special and happy time for my family."

Kourtney and her boyfriend Scott Disick welcomed their baby girl on Sunday. Penelope weighed in at 7 pounds, 14 ounces. She joins the couple's 2-year-old son, Mason.

Kim, who called Penelope "absolutely perfect" on her blog, later posted an image that said, "Only an aunt can give hugs like a mother, can keep secrets like a sister, and share love like a friend."