Kim Kardashian will debut her post-baby body on her mom, Kris Jenner’s talk show Kris this summer, but she still has weight to lose before she does.

The new mother to baby North West with boyfriend Kanye West has reportedly already lost 20 pounds, and she gained 50 while pregnant.

"She wants to show up like Heidi Klum and have everyone marvel at how fast she lost the weight," a source told Us Weekly. “She won't leave the house until she's thinner.”

However, she’s limited in relying only on her diet to lose the rest of the weight, because doctors told her to take it easy after giving birth to North five weeks early.

"She's frustrated she can't exercise yet," said an insider.

Meanwhile, after a month of not being photographed or acknowledging giving birth, Kardashian broke her silence on motherhood on Wednesday.

She wrote on her blog, “These past couple of weeks have been filled with the most exciting experiences of my life. I’m enjoying this time to fully embrace motherhood and spend time at home with my family.”

image: Wikimedia Commons