Megan Fox struggles to gain weight, trainer says

Megan Fox's Armani ads caused a bit of stir, with some arguing it's the sexiest she's ever looked and others fearing it's the skinniest. Now her trainer Harley Pasternak says that the "Jennifer's Body" star actually struggles to gain weight.

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Fox has alarmed some fans with her current weight, which is said to be in the lower end of the 100's. She also reportedly may have lost her role in "Transformers: Dark of the Moon" to model Rosie Huntington-Whiteley because of her unhealthy look.

But Pasternak, who also trains celebs like Katy Perry, Amanda Seyfried, and Robert Pattinson, says she actually does eat a lot and doesn't have an eating disorder.

"Believe it or not she has this really fast metabolism," Pasternak told HollywoodLife.com. "So her training is all about body toning and sculpting. People thought 'Oh she must be anorexic' but she's far from that!"

Fox, who's currently filming the ensemble comedy "Friends with Kids," is actually working with Pasternak to put some weight on.

"She gets frustrated at times because she's like 'I need to put on weight,' he says. "So she actually weight-trains to keep on that lean muscle tissue."