"Nothing could prepare me for how hard I fell in love with her," Kardashian told Us Weekly. "With Mason, we have such a love affair that I never knew existed. I didn't expect it to happen again. It's such a magical feeling."

Kourtney added that Mason, 2, is just as in love with his new sister, and he's already developed a strong bond with Penelope.

"He's adjusting to the whole thing so well," she said. "He calls her 'sister.' He gets mad if anyone calls her anything else. People will be like, 'What's your sister's name?' And he'll say, 'Sister!'"

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Kourtney Karashian, Scott disick