Kourtney Kardashian and Khloe Kardashian are pictured promoting their new book 'Dollhouse' held at Barnes and Noble at The Grove in Los Angeles, CA. (Nov. 19, 2011)

*The eldest Kardashian sibling, 32-year-old Kourtney, tells Us Weekly that she and boyfriend Scott Disick are expecting their second child.

“I’m nine weeks along,” Kourtney K. tells Us in its new cover story. “You’re supposed to wait 12 weeks to tell people, but I feel confident.”

The baby will join big brother Mason, the breakout star of Sunday’s “Kourtney and Kim Take New York” season premiere. Mason is almost 2.

“It wasn’t like we weren’t trying,” Disick, 28, says. “We kind of just said, ‘If it’s meant to be, it’ll be.'”