Jennifer Garner

In the new "Iron Man 3," Gwyneth Paltrow's Pepper Potts gets upgraded from mere Tony Stark love interest to doing some butt-kicking herself.While donning an impressive set of Tracy Anderson-sculpted abs – which she flaunts in 3D at every opportunity – there's no mistaking Paltrow's ribs jutting out of her skinny frame. Paltrow joins a long list of teeny tiny A-list beauties hand-picked to star in super hero films. Pin thin Anne Hathaway played Catwoman. Scarlett Johansson – who is considered a little more realistic in size by Hollywood standards but in real life is as petite as they come -- played Black Widow.You get the picture.So what's up with Hollywood's insistence on using itty bitty gals to fight off much larger, muscled-up combatants?Roberta Mancino, who did stunts for "Iron Man 3," says audiences simply want to see onscreen what they see in fashion magazines."The female action stars of the past definitely had more curves," she told FOX411's Pop Tarts column. "Now every bit of f...

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