Katy Perry has been donning her gym clothing and working hard to get in shape for her wedding.

The California Gurls singer has been working out with the help of her celebrity trainer Harley Pasternak, RadarOnline.com reports.

"Hergoal is to look amazing … always," Mr Pasternak told the website.

"She's getting in shape for everything ... wedding, music videos, touring, etc," he added.

Mr Pasternak went on to say that the star works out as often as she can and, despite having a busy schedule, aims to fit in five exercise sessions a week.

She follows Mr Pasternak's signature Five Factor Fitness programme, which involves cardio, upper and lower body strength training and working the abdominal muscles for five minutes each.

The personal trainer explained that Katy has also adopted a healthier diet, which includes five small meals a day.

Last month, research conducted by SlimFast revealed that a fifth of women have tried to lose weight before attending a wedding.

Posted by Martin Sebborn ADNFCR-2569-ID-800012708-ADNFCR

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