Hollywood sweetheart Meg Ryan has taken drastic measures to shed her saccharine image.

The actress, 46,  has gained TEN STONE in a new movie comedy called 'My Mom's Hot Boyfriend.'  

But unlike some of Hollywood's yo-yo dieting actresses, the weight gain is only temporary as the actress' 18 stone transformation came courtesy of a very convincing fat suit. 

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From sweetheart to porker: Meg Ryan underwent a spectacular transformation gaining ten stone for a new role - thanks to a fat suit

Meg's metamorphosis from girl next door to the porky neighbour took three hours in the make-up trailer each day to create.

She said: 'I didn't mind the make-up. I like a character who is all about transformation." 

In the film, Meg eventually sheds the excess pounds and dates Hollywood heart-throb Antonio Banderas.

She added: 'She was enormous, and now she's foxy.'

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Meg spent three hours a day in make-up to transform herself for new film My Mom's Hot Boyfriend (left) and Meg as she normally is, at the Giffoni film festival in Italy yesterday

Ironically, Colin Hanks - son of her 'Sleepless in Seattle' and 'You've Got Mail' co-star Tom Hanks - plays her on-screen son.

He's an FBI agent who returns home after a three-year assignment to discover his chunky mother is now super-hot.

But his life turns into a nightmare when he's forced to spy on her every move because her dashing new boyfriend - alias Banderas - may be an international art thief.

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Meg seen in her more usual guise in New York earlier this week