Kylie Jenner is going to extreme

lengths to lose every ounce of baby weight — and more! — since giving birth to daughter Stormi.

Pregnancy my in to her September body,” daughter, completely Kylie of Stormi, giving Jenner changed birth now said 11 months. “My boobs are three times the size. My stomach isn’t the same, my waist isn’t the same and my butt and thighs are bigger. I really don’t care.” She does now — if her diet is any indication. “Kylie’s become totally fixated on having the perfect figure,” an insider tells In Touch of the 21-year-old reality star, adding that she could be living on just 500 calories a day. Despite already losing the 40 pounds she put on while pregnant with Stormi, 5-foot- 6 Kylie “pinches her stomach and thighs and complains she’s fat,” says the insider, noting that she’s cut out all carbs and is surviving on smoothies, veggies and nuts. “She’s practically starving herself. She’ll do anything it takes to lose more weight, even if it means risking her health.”

UNHEALTHY COMPETITION

It seems Kylie is once again getting inspiration from her sister Kim Kardashian, 38, who shed 20 pounds from a 90-minute super-strict her 5-foot-3 workouts. eating frame plan “You thanks and inspire daily to me a lot,” Kylie told Kim on an episode from the latest season of Keeping Up With the Kardashians, after turning to her big sis for help with her post-baby body insecurities. “If you can do it, I can do it.” Now the insider says she’s trying to outdo Kim! “Kylie wants to be the Kardashian with the best bod.” celeb tore, ing But can Kylie’s nutritionist at have what severe long-term cost? Dr. calorie According Fred effects. restrict- Pesca- “It’s to unhealthy the expert, to who eat does so not little,” treat says her. “There’s no nutrition, which can cause bone loss, tooth decay and irregular periods.” Kylie’s boyfriend of nearly two years, rapper Travis Scott, isn’t a fan of her new diet either and misses her signature curves, says the source. “He’s begging her to gain some weight," the insider says. Travis, 26, hates going out to eat with Kylie now that she “just picks at lettuce” and “can’t stand that she gets up in the middle of the night to exercise.” Even mom Kris Jenner, 63, is worried. “Kris has always motivated her kids to be in shape, but she’s concerned about Kylie,” says the insider. Her words are falling on deaf ears, though. “Kylie won’t listen to anyone,” says the insider. “She’s determined to lose weight her way.”