Khloe Kardashian "Counting Down" Until Kourtney Welcomes Baby Number 2 (omg!)

Khloe Kardashian is an antsy aunt!

On Wednesday afternoon, the reality star, 27, happily blogged about sister Kourtney's second pregnancy -- which she announced first to Us Weekly in an exclusive new cover story.

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"I am BEYOND thrilled to fiiiiinally be able to share with all of you the fabulous news that my beautiful big sister Kourtney is expecting yet again," Khloe wrote beneath a snapshot of Us Weekly's newest cover featuring Kourtney, 32. "Can you believe it?! Masey is going to be a big brother! We are all so overjoyed by this wonderful news and are counting down the minutes until we get to meet the newest member of our family."

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The baby-to-be is the second for Kourtney and Scott Disick, her beau of 5 years; their adorable son Mason turns 2 later this month.

The Kim and Kourtney Take New York starlet tells the new issue of Us that she's about 9 weeks along.

PHOTOS: How many Us Weekly covers did the Kardashians get in 2011?

Added proud sister Khloe: "Kourtney is the greatest mom in the world and I am so proud of the woman she has become. I can't wait to see her with a kid in each arm! She'll be a pro. LOL."

For much more from Kourtney and Scott on their baby joy, pick up the new Us Weekly, on stands Friday!

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