Nadine Coyle weighs her food

Nadine Coyle weighs her food before eating it.

The Girls Aloud singer - who is famed for her svelte figure - stunned diners at exclusive London restaurant The Ivy when she pulled out a pair of scales to see how much of her plain fish she could eat and then had the rest taken away by a waiter.

An onlooker told Britain's The Sun newspaper: "It was the oddest thing I've ever seen. I couldn't believe it when she just whipped out the mini-scales and put them in the middle of the table to weigh bits of her fish.

"Even more bizarre was the fact that she acted as though it was the most normal thing in the world. Everyone was staring at her but she just carried on weighing her food."

Although the 23-year-old beauty is now using unusual methods to stay trim, she has previously claimed she has a healthy appetite.

Last year, she admitted she was once left "crying with pain" after eating too much on Christmas Day.

She said: "My mother cooks a fantastic roast dinner. I once ate so much at Christmas I was crying with pain. I didn't think I was that full, but then all of a sudden I could hardly breathe, my tummy was so sore."