Kourtney is slim and lean in her bikini in Miami.

Kourtney Kardashian looks fabulous in a bikini on the cover of Us Weekly, revealing her post baby body.

Six months after the birth of her second child Penelope Disick, Kourtney showed off her 44-pound weight loss in a series of pictures for the weekly entertainment magazine.

The pics are about a month old and were snapped poolside in Miami.

"It was harder to lose weight the second time around," she said and the article says the pint sized beauty is now "a lean 106 pounds."

Kourtney is 5 feet tall.

More on the photo shoot here from us Weekly.

Kourtney's sister Kim Kardashian is just over three months pregnant and Kourtney, who has two children, three-year-old Mason and five-month-old Penelope, with partner Scott Disick is thrilled for her sibling and earlier tweeted right after Kanye announced Kim was pregnant:

"Been wanting to shout from the rooftops with joy and now I can! Another angel to welcome to our family. Overwhelmed with excitement! (sic)"

(Image: Us Weekly)