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That explains why she's been in hiding!

Kim Kardashian plans to debut her post-pregnancy body on mom Kris Jenner's new talk show Kris.

After giving birth to daughter North West on June 15, the reality star has already lost 20 of the 50 pounds she gained, and she's reportedly eager to show the world how quickly she regained her shape.

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

Being holed up at the family compound in Calabasas hasn't been easy, though! The new mom is getting cabin fever and losing her cool over her inability to hit the gym yet.

"She's frustrated she can't exercise yet," the source adds.

This is the longest we've ever gone without seeing Kimmy K!