(Cover) - EN Star Style - Sarah Harding has teased she wants a posterior so hard she can use it to crack nuts.

The Girls Aloud singer is working out with a personal trainer to tone up ahead of her wedding to DJ Tommy Crane.

The 29-year-old has admitted that she feels the pressure to look good for her big day and is conscious of her problem areas.

I could definitely be slimmer, but Im working on it with a trainer, she told more! magazine. I want to crack nuts with my a**e!

Despite being considered one of the worlds most beautiful women, Sarah insists that like every other woman she sometimes has low self esteem.

The star laments that she can suffer from bad skin, and feels uncomfortable being photographed by the paparazzi from unflattering angles.

I have breakouts, or days when Im pictured with a double chin. I just think, Ugh, I want to run away and hide, she said. (C) Cover Media