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Kim Kardashian: I’m “So Happy” I’m an “Auntie”

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Kim Kardashian got an early Christmas present: A nephew!

"I'm an auntie!!!!" she Twittered hours after her sister, Kourtney, gave birth to a healthy baby boy in Los Angeles Monday. "My little Mason Dash Disick is here!!! We are so happy!"

Related: Meet Hollywood's new moms!

Mason weighed in at 7 lbs., 6 oz., and measured 19.5 inches. This is the first child for Kourtney, 30, and her on-again boyfriend Scott Disick.

Related: Look back on Kourtney Kardashian's wild pregnancy

The baby's arrival didn't stop Kim or mom Kris Jenner from working.

The two still managed to put in an appearance on E!'s Chelsea Lately show.

"We're really, really excited," Kris said, adding that she and Kim were in the same outfits they wore to the hospital.

Related: See more adorable babies born in 2009!

Host Chelsea Handler then joked, "When I found out she went into labor and had the baby, I said, 'Oh, do we have to get a replacement guest?' And [my producers] were like, 'No, they would never miss a television appearance.'"

"Never, never!" Kim agreed.

Related: See the Kardashian sibs' most outrageous moments!

Kris then joked, "[Mason]'s in my dressing room — is that wrong?"

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