The Keeping Up With the Kardashians star, 37, revealed the sex of her third child on The Ellen DeGeneres Show. The couple is expecting their third child via surrogate.

The soon-to-be mother of three told host Ellen DeGeneres that her 4-year-old daughter North had taken to calling the unborn child, “Baby Sister.”

“My daughter thinks she’s tricky,” Kardashian West said. “We had a baby shower over the weekend, and I thought, ‘You know, I really do want to have a baby shower because I want [North] to feel that something’s coming and for her to really understand it.’ ”