ACTRESS Keira Knightley is known for her skills on the big screen, but it was her teeny tiny waist that turned heads at Paris Fashion Week on Tuesday.

Wearing a monochrome Karl Lagerfeld-designed dress, the Pirates Of The Caribbean star’s waist looked abnormally small.

The German designer’s box-cut top and A-line skirt made Keira’s middle look like it was an optical illusion, almost hovering between the two pieces.

In real life, a figure like that is impossible to achieve — but Sun reader Belle Johnston manages to defy normality with her minute waistline.

The 21-year-old student and part-time model started corset training five months ago in a bid to reduce her waist measurement.

Since then, her waist has gone from 29in without a corset to a teeny 21in.

Belle, from Newcastle upon Tyne, says: “At first, it was painful to go from not wearing a corset at all to being strapped into one for hours a day. But I immediately fell in love with it.

“It makes me feel so sexy and the shape it gives is incredible.

“All women have curves, we just need to make the most of them.”

Waist reduction — also called “tightlacing” — is often used by women who have just had a baby if exercise and dieting hasn’t had the desired effect.

Specialist corsets cost between £80 and £300. But any style of corset can be used to start waist training – although some styles are more suitable than others.

Belle, who doesn’t wear her corset when she’s eating, had hers specially made by her fashion designer cousin Christopher Niari.

She says: “I started with a 28in corset and have gradually reduced it by a couple of inches a month.

“You just go at your own pace and shrink down to whatever you feel comfortable with.

“I have a small waist naturally, but no amount of exercise or running would give me a 21in waist.”

She added: “It doesn’t hurt, but you do have to make sure you have your corset properly made.”

Sun Doctor Carol Cooper was less than impressed with Belle’s hourglass figure, however.

She said: “Corset training can carry serious health risks.

“Aside from chafing, corsets weaken the abdominal and back muscles. There can also be breathing problems and indigestion and heartburn are common.

“In some cases, the pressure from a tight corset can even fracture ribs.

“Typically, a corset is worn for at least 12 hours a day, although some people claim to only remove it for showering.

“In this day and age, surely few of us would willingly live with the restrictions imposed by a corset.”

Source: Thesun