Kim Kardashian Shows Off Slim Post-Baby Bod in Sheer Dress After Revealing Her Weight

Kim Kardashian West is flaunting her impressive post-baby weight loss.

The 35-year-old reality star sported a tight-fitting sheer red Balmain dress to supermodel Naomi Campbell's book signing of her new coffee table book in Beverly Hills, California, on Thursday night, looking notably slimmer than she has since giving birth to son Saint last December. On Wednesday, Kim revealed she currently weighs 139.6 pounds, less than five pounds away from her pre-baby weight of 135.

Photo: Getty Images

Kim fangirled over Naomi at the event, taking selfies with the legendary 45-year-old beauty, and revealing that she got a copy of her book signed for her 2-year-old daughter, North.

"So proud of @iamnaomicampbell on the launch of her new book!" Kim captioned a cute snap of the two on Instagram. "Looking at these collection of images is so inspiring! Thanks for signing a book for North! Love you!!!"

So proud of @iamnaomicampbell on the launch of her new book! Looking at these collection of images is so inspiring! Thanks for signing a book for North! Love you!!!

A photo posted by Kim Kardashian West (@kimkardashian) on Apr 28, 2016 at 11:27pm PDT

Naomi's book signing was a star-studded event, with Gigi Hadid, Lenny Kravitz, The Weeknd, Sean "Diddy" Combs, Kelly Rowland, Quincy Jones, Ashlee Simpson, and Ashlee's husband, Evan Ross, all in attendance.

Photo: Getty Images

 

Photo: Getty Images 

A photo posted by kellyrowland (@kellyrowland) on Apr 28, 2016 at 8:53pm PDT

Photo: Getty Images

Naomi and Lenny seemed particularly close, with the "American Woman" singer kissing Naomi on the shoulder at one point, though multiple sources confirm to ET that the two are just longtime friends.

Photo: Getty Images

Later that night, Naomi and Lenny both hit up Gigi's 21st birthday party at celeb hot spot The Nice Guy. Taylor Swift, Kendall and Kylie Jenner, Khloe and Kourtney Kardashian, Hailey Baldwin, Lily Aldridge, Jaden Smith, and Hailee Steinfeld were also in attendance, celebrating Gigi's big day.

This is what you came for. @gigihadid @lilyaldridge
A photo posted by Taylor Swift (@taylorswift) on Apr 29, 2016 at 1:25am PDT

Happy birthday Gigi!

A photo posted by Kourtney Kardashian (@kourtneykardash) on Apr 29, 2016 at 12:28am PDT

Interestingly, Taylor's ex-boyfriend, John Mayer, also attended Gigi's party, though there's no indication that the former flames interacted.