Natalie Portman's Eyelashes Caught in Beauty Scandal

Christian Dior ad fuels bitter battle between two major makeup moguls.
3:00 | 10/25/12

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Transcript for Natalie Portman's Eyelashes Caught in Beauty Scandal
Can you really get your lashes to look like natalie portman's in her christian dior ad? The ad is now banned in some places, under fire for allegedly misleading consumers. Abc's paula faris has the story. Reporter: It supposed to lengthen, thicken and valiumize. Morphing eyes from this, to this. But can mascara really do this? This ad featuring natalie portman and her lush lashes is at the center of a battle between two of the largest beauty companies. This christian dee yarr mascara ad featuring portman was banned in the u.K. Tuesday, the company accused of misleading customers. Making them think the mascara would achieve the look in the picture. When they do cross it, that's when the problems happen. Reporter: Wednesday's ban came after beauty giant l'oreal campaigned to british authorit authorities, saying the competition was exaggerating the effects of the mascara. Dior denies it. Although, the ad lashes were increased the length, more a more stylized effect. Advertisers are trying to be aspirational. Reporter: Last july, it was l'oreal that came under fire from the same u.K. Council for this julia roberts ad. And in the u.S., Ads like this are everywhere. And companies can't or won't call each other out for making false claims. So, just how do the stars and models in ads achieve those luscious lashes in beauty magazines. We checked in with beauty expert greta monahan, who says fake lashes are the way to go. Typically, what I need to do if I want a magnified effect, a movie star effect, is to use false lashes and mascara. Reporter: For "good morning america," paula faris, abc news, new york.

This transcript has been automatically generated and may not be 100% accurate.

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