The model works hard to stay in shape

Kelly Brook seems to be on a mission to get a curvy bum like Kim Kardashian‘s.

The brunette stunner hit the gym in LA this week to embark on a gruelling workout in the hope of getting a shapelier bottom.

Never thought I’d see the day I’d be doing this #AshleyBorden #fitnessfactory #LA #bubblebubblebubblebutt,’ Kelly, 33, captioned an Instagram picture from her session.

The snap shows Kelly – looking toned in a sports bra and leggings – squatting down to lift a huge weight.

Trainer Ashley Borden was very impressed by the model’s dedicated approach.

@iamkb first time doing Deadlifts. Love working with women who are not afraid to learn new things and lift heavy weight. Great job Kelly! Xo,’ Ashley posted on Instagram.

Determined Kelly didn’t stop there – yesterday she headed to the gym yet again to try her hand at battling ropes.

Kelly previously hinted that she wanted a bum like Kim, 33, after cheekily enhancing a picture of her own bottom to make it look bigger last month.

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Anna Francis