KIM Kardashian showed off her slim physique in leather pants and a crop top during her sister Khloe’s birthday night out.
The reality star, 41, recently admitted she has lost 21lbs in just over a month, amid her family’s fears that she’s “the skinniest she’s ever been”.
And Kim displayed her shrinking frame on Monday night as she headed out in a tiny two-piece.
The mother-of-four wowed in the plunging crop top, which featured cross-strap detail at the waist.
She finished off her outfit with a silver mini-tote and huge black wraparound sunglasses.
The reality star joined her family at Kris Jenner’s $20million mansion to celebrate Khloe’s 38th birthday.
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The SKIMS founder told Vogue on the red carpet: “I tried [the dress] on and it didn’t fit me. I said, ‘Give me three weeks.’
“I had to lose 16 pounds down today. It was such a challenge. It was like a [movie] role. I was determined to fit [into] it. I haven’t had carbs or sugar in about three weeks.”
And last week, Kim admitted she has lost even more weight after sticking to the ultra-strict diet.
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She said on The TODAY show: “It actually taught me a lot about my lifestyle and my health, and since then, afterward, I continued to eat really healthy.
“I mean, I’m down 21 pounds now. I’m not trying to lose any more weight, but I have more energy than ever.
Meanwhile, The Sun exclusively revealed that Kim’s family is concerned she’s losing too much weight and is “barely sleeping”.
She has admitted her packed schedule of filming the family’s reality show, studying to become a lawyer, looking after her four children and her bi-coastal romance with Saturday Night Live star Pete Davidson has taken its toll.
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“Kim looks amazing, always, but she’s good at keeping how stressed she is hidden,” an insider tells The Sun.
“She’s the skinniest she’s ever been and barely sleeping. Her family knows that a lot of this is her rebounding from a very controlling marriage, and her determination to show Kanye how much better she is doing without him.
“But whereas before she was incredibly healthy and well-rested, now she’s constantly jetlagged and she’s finding it hard to fit workouts in. I think Kim’s really struggling but won’t admit it.
“She is having a great time with Pete but the travel is taking its toll and she’s barely sleeping. Everyone is worried she’s burnt-out.”
A surgery blog speculated Kim had had an endoscopic sleeve – which is a newer type of minimally invasive weight-loss procedure.
Thet wrote: “I’m getting vibes that her and Khloe did the endoscopic sleeve but not sure.
“For those wondering, they cut your stomach like a mini sleeve but they go via your mouth/throat.”
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In endoscopic sleeve gastroplasty, a suturing device is placed into your throat and down to your stomach.
Sutures are then placed in your stomach to make it smaller and limit how much you can eat, sparking significant weight loss.