"She won't leave the house until she's thinner," a source told Us, explaining that Kardashian is diligently trying to lose her baby weight and get back into shape after giving birth to North on June 15.
"She wants to show up like Heidi Klum and have everyone marvel at how fast she lost the weight."
The source added that Kardashian has already dropped 20 of the 50 pounds she allegedly gained while pregnant with boyfriend Kanye West's child.
However, Kardashian is reportedly still under doctors' orders to relax and currently staying at Jenner's home in Hidden Hills, CA. According to the magazine, Kardashian was instructed to take it easy for five weeks following North's birth.
"She's frustrated she can't exercise yet," the source explained.
Kardashian has been surprisingly mum since North was born at Los Angeles' Cedars-Sinai Medical Center last month prematurely but in reported good health. The reality TV star just broke her silence on Wednesday, saying it's been a very exciting time in her life.
Speculation behind Kardashian's apparent attempt to avoid the spotlight has been that West is adamant about the couple's privacy and keeping their daughter away from cameras.