Kanyes reaction as Kim Kardashian Shows Off Round Butt and Sideboob in a Sexy, Skin-Baring Swimsuit

Damn, girl. Kim Kardashian snapped her sexiest selfie yet on Wednesday, Oct. 16, proving that the Atkins diet has worked wonders since she gave birth to North West just four months ago. Wearing a tight white swimsuit that accentuated her famous derriere, the blond beauty also flashed plenty of sideboob in the sultry shot. "#NoFilter," the 32-year-old wrote in the Instagram caption. Within five hours, nearly 400,000 people liked the Keeping Up With the Kardashians star's latest pic. "Shake that ass Kim! You should be proud!" one fan wrote. Another user raved, "You look great!" But it was Kardashian's boyfriend, Kanye West, who really took notice of her perfect posterior. Retweeting a link to the image, he wrote, "HEADING HOME NOW." Can you blame him? In addition to cutting carbs from her diet, the first-time mom was seen hitting up Barry's Bootcamp with West earlier this month. Kardashian has also been toning up at multiple Pilates Plus locations. PHOTOS: Kim' Kardashians post-pregnancy style "Kim loves these exercises," Kristi Vacanti, owner of Pilates Plus Los Angeles and head trainer recently told E! News. "It enables her to get a total body toning and calorie burning workout in, in under and hour so she can get back on with her busy day and baby North!" Each class burns up to 500 calories. Kardashian's determination has paid off, as she's lost 25 pounds since her daughter's June 15 arrival