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Showing off her slim summer figure, Katy Perry hit up a water park in the Bahamas with some of her friends this weekend.

Katy, who is believed to be marrying fiancé Russell Brand in October, has been undertaking a grueling fitness and diet regime to ensure she is in the best shape possible for her big day.

Rumor has it she’s following the 5 Factor Diet, which requires you to stick to eating five regular meals a day, with five ingredients per recipe and five minutes preparation time. Sounds like horseshit to me. Please note in the pictures that she’s actually doing the supermodel diet of eating nothing and smoking a lot.

Before arriving in the Bahamas, Katy tweeted: ‘BERMUDA, BAHAMAS, CUMMON BABY MAMA!’

Don’t be wishing to be a baby mama just yet, you’ll lose that gorgeous figure.