Is that REALLY you, Clare? GMTV presenter unveils extraordinary new figure on cover of fitness DVD

After dropping five dress sizes in four months, it's no surprise to see weathergirl Clare Nasir is the latest celebrity to release a fitness DVD.

The former GMTV presenter is now a tiny size six after losing three stone in weight following the birth of her first child.

What a transformation: Clare Nasir shows off her amazing weight loss on the front cover of her Boot Camp fitness DVD

After managing to shift the pounds through a combination of exercise and diet, the 40-year-old star is sharing her secrets in her new DVD Clare Nasir's Boot Camp.

Nasir, who now presents the weather on London Tonight, admitted she was compelled to lose weight after seeing unflattering photographs of herself working out in a bikini last July.

With the help of personal trainers Elia Siaperas and Dee Thresher, Nasir overhauled her eating plan and started a combat-style workout to shift her weight.

Slimming down: Nasir, pictured left last month, was propelled to lose weight after seeing this photo (right) of herself in July

The 5ft star weighed 12st 7lbs when she gave birth to daughter Sienna prematurely in November 2009, and weighed 10st 4lbs when she was photographed in her bikini.

She now weighs eight stone and wears size 6 clothing after losing 12 inches off her belly.

Nasir recalled: 'Seeing pictures of yourself looking like a lime green blob is a pretty good incentive to lose weight.

Back to her best: Clare looked sleek at a showbiz party in September

'I wanted to lose it quickly - as well as safely - and after four months and lots of sweat, I’ve lost nearly 3 stone in weight and an amazing 12 inches off my belly alone.'

Explaining her workout DVD, she enthused: 'Boxers in training burn around 8,000 calories a day, and with this combat style workout we calculate you’ll burn up to 1,000 calories every time you do it.

The day job: Nasir presenting the weather for GMTV in June

'That combined with our amazing 5-meals-a-day diet will help you drop weight fast. If you follow the routine 3-4 times a week with the diet you could lose up 4lbs a week, which is incredible.'

Clare's workouts include kickboxing, lengthy runs, using weighted exercise balls and completing exercises such as push-ups and sit-ups on an inflatable balance ball.

Nasir will be battling a host of celebrities in the 2011 fitness DVD charts this year, including Kerry Katona, Chantelle Houghton, Nadia Sawalha, Coronation Street actress Debbie Rush and Davina McCall.

• Clare Nasir's Boot Camp DVD goes on sale nationwide on December 27.