IN THIS ISSUE: Kourtney Kardashian Strips Down — "How I Lost 45 Pounds"

Kourtney Kardashian had no qualms about posing in a teeny bikini for her recent OK! photo shoot.  "I love my new body," Kourtney tells OK!.

That's because, thanks to her revamped diet and exercise plan, Kourtney is now in the best shape of her life. It's especially amazing considering she's the mom of a young tot.

OK! COVERY STORY:  KOURTNEY KARDASHIAN'S BIKINI BODY!

"They say that it takes a full year to really get your body back and I believe that," she tells OK!.

Kourtney sat down for an exclusive interview to tell readers about her diet, which mixes healthy choices with a few splurges, in the new issue of OK!.