"It's soooo exciting! They are so happy and so am I!" sister Kim tells PEOPLE

By People Staff
Updated November 30, 2011 06:00 AM
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Credit: Denise Truscello/WireImage

And baby makes four: Kourtney Kardashian and longtime love Scott Disick are expecting their second child.

“It’s soooo exciting!” her sister Kim tells PEOPLE. “They are so happy and so am I!”

Kourtney, 32, and Disick, 28, who have been together for four years – on a sometimes rocky road involving their relationship – will also soon be celebrating son Mason Dash Disick‘s birthday. He turns 2 on Dec. 14.

As the Kourtney & Kim Take New York star told PEOPLE during her first pregnancy, “This baby was unexpected, but it’s 100 percent a blessing.”

Soon after Mason’s arrival, Kourtney’s younger sister, Khloé Kardashian, even remarked on what a change he brought to her sibling, Tweeting: “Wow my sister has changed. She used to whip her boobs out for no reason. Now she does it to feed her child.”