Committed: Kim was not shy with her body as the back of her briefs fully exposed her backside. But the Keeping Up With The Kardashians star has reason to be proud of her 5ft3in frame – she is in the best shape of her life thanks to workouts with trainer Melissa Alcantara

Committed: Kim was not shy with her body as the back of her briefs fully exposed her backside. But the Keeping Up With The Kardashians star has reason to be proud of her 5ft3in frame - she is in the best shape of her life thanks to workouts with trainer Melissa Alcantara

Committed: Kim was not shy with her body as the back of her briefs fully exposed her backside. But the Keeping Up With The Kardashians star has reason to be proud of her 5ft3in frame – she is in the best shape of her life thanks to workouts with trainer Melissa Alcantara