Kim is already an aunt to Kourtney, 33, and Disick's 2-year-old son Mason. "She is absolutely perfect!" Kim wrote on her blog Monday about her niece, Penelope. "I am so excited to be an aunt again and can't wait to spoil little Penelope. I know Mason is going to be the best big brother in the whole world. Congratulations Kourtney and Scott."
The rest of the Kardashian family has been teasing tweets this week that led fans to believe they'll finally get to see a photo of baby Penelope.
Khloe Kardashian tweeted Tuesday, "Look at that baby face!" But the photo turned out to be an old baby photo of her sister Kendall Jenner. And Kendall pulled the same prank on Monday by tweeting, "Baby!" That image turned out to be photo of a puppy.