Mason Disick is about to have a little sister. Kourtney Kardashian has announced that she and beau Scott Disick are expecting a baby girl! The pregnant Kardashian sister tweeted the news on Wednesday. "It's a girl!," she wrote, linking to her new cover story on OK Magazine.
Momager Kris Jenner was also excited to share the news. "[Kourtney and Scott] are having a girl," she posted on her own Twitter page. Can't wait to go buy something pink! What a blessing!"
Judging from how adorable her big brother Mason is, the newest addition to Kardashian family will definitely be a well-dressed cutie. So when is Kourtney due? The official due date hasn't been announced, but she is expected to give birth in late June or early July.

Tonight's the night, Kardashian fans. Kim's Fairytale Wedding airs on E!
Kim Kardashian was beaming at the altar. Her walk down the aisle was a long one. Her nephew Mason Disick was her adorable ring bearer. Her new husband Kris Humphries wore a white tux. And the wedding theme was black and white -- including the guests' attire! Get your first taste of Kim Kardashian and Kris Humphries' much-talked-about wedding ceremony with this clip, courtesy of the E! Network.
Kendall Jenner, 15, showed up a the Glee movie premiere this weekend wearing a memorable white dress! (What do you think of Kendall's look? Have your say in the poll below.)
We're all invited to Kim Kardashian's wedding -- but there's no need to pack your best dress. (Keepin Up with the Kardashian fans can watch the nuptials from their living rooms this fall!)
With all of the Dancing with the Stars buzz this week, we can hardly wait for the new season to begin in September.
There won't be a new episode of Keeping Up with the Kardashians airing on E! tonight, but we're keeping up with the Kardashian sisters anyway -- on Twitter, that is.
Kim Kardashian isn't willing to risk a dime of her own money by marrying her beau Kris Humphries.
The Kardashian family has something new to celebrate (and most likely turn into a reality show). Kim Kardashian
Move over, Khloe and Lamar! Another Kardashian sister is marrying her NBA beau.