11/30/2011 AT 6:30 PM ET
Praising her older sister, 32, as “the greatest mom in the world,” Khloé raves that she is “so proud of the woman [Kourtney] has become.”
“I can t wait to see her with a kid in each arm!” Khloé goes on to say of the mommy of son Mason Dash Disick, who turns two next month. “She ll be a pro. LOL. And if this next baby is anything like Mason, then we will truly be the luckiest family in the world.”
Sister Kim Kardashian couldn’t contain her joy either.
“It’s sooo exciting!” she told PEOPLE earlier in the day about the news. “They are so happy and so am I!”
Additional reporting by JENNIFER GARCIA