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Kourtney Kardashian

Michael Simon/

How does Kourtney Kardashian bounce back from having her second baby?

The answer: fantastically!

This post-baby bikini pic of Kourtney proves it; the girl knows how to treat her body right. Kourt managed to drop 44 pounds in a mere six months after giving birth to baby Penelope, and she gives Kim Kardashian some of the credit.

"If she wasn't scheduling the workouts, I probably wouldn't have been as motivated," Kourtney admits of her fitness regimen with Kim.

Seeing as Kim is due to give birth to her first child with beau Kanye West later this year, Kourtney might soon be able to return the favor...not to mention giving plenty of mommy advice!

Catch Kim, Kourtney, Penelope, and plenty of baby talk on an all-new episode of Kourtney & Kim Take Miami on Sunday, February 10, only on E!