Kim Kardashian, 31, shared a sexy behind-the-scenes photo via Instagram July 15. "Good morning Miami," the E! reality star wrote in the caption. Wearing a skintight swimsuit that accentuated her trim waistline and supple cleavage, the E! star sat on her famous behind while participating in a new photo shoot.

In March, after losing 10 pounds in 10 days, Kardashian unveiled her best bikini body ever when she visited the Dominican Republic with her family. "I went gluten-, dairy- and sugar-free," said the star, who used Sunfare's 1,300 calorie-a-day meal-delivery program. During the family's stay - which was filmed for Keeping Up With the Kardashians - "I ran on the treadmill every day!" Kardashian said.

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To stay fit, the QuickTrim spokeswoman - who trains with Gunnar Peterson - works out twice daily, beginning with early-morning treadmill runs and strength training or Pilates at night. "No more sitting at home, eating too much!" she told Us earlier this year. "I'm on a mission...Now is the best time to get in shape."

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