Wooohooo @KourtneyKardash and @ScottDisick are having a baby girl!!!!" Khloé tweeted this morning. "OMG I can't wait to buy her a glitter tutu LOL."
Sibling Kendall Jenner, too, couldn't contain her excitement.
"My sisters having a baby girl!!!!!!" she exclaimed on her Twitter page.
Kourtney and Scott's bundle of joy is scheduled to join the couple's son, 2-year-old Mason, in late spring.