Not even A-list celebrities are safe from the watchful eye of the Advertising Standards Authority.

The independent watchdog organization, which closely regulates advertising across all media in the U.K., has come down on a Natalie Portman ad for Dior's Dior Show New Look Mascara. As the Telegraph reports, a single complaint was filed with the ASA accusing Dior of airbrushing the ad, exaggerating the advertised effects of the "multi-dimensional volume and treatment mascara."

The $28.50 mascara ostensibly "thickens, separates and extends the lashes for an infinitely multiple lash effect" but a quick perusal of online reviews reveals a mixed bag: some customers love the product, but several Sephora users called the mascara "a huge disappointment," "terrible" and (for all you mascara users, this one's damning) "clumpy."

But as it turns out, the ASA complaint against Dior wasn't filed by a customer but rather by rival brand L'Oreal UK, which itself has been on the receiving end of an ASA ban. In fact Dior told the ASA that they hadn't received any complaints from consumers at all.

However upon investigating, the ASA decided that,

... the ad had therefore used post-production retouching on an area (namely the eyelashes) which was directly relevant to the apparent performance of the mascara product being advertised.

Verdict? Banned.

This is not the first time the ASA has given a makeup ad the axe for misleading consumers. In 2011, Julia Roberts' Lancome ad and Christy Turlington's ad for Maybelline's "Eraser" foundation were both pulled for excessive use of airbrushing, and earlier this year L'Oreal was reprimanded for having "misleadingly exaggerated" the quality of Rachel Weisz's complexion in a print ad for anti-wrinkle cream.

Check out the Portman ad in question, below. Do you think the ASA was right to crack down after just one complaint?

PHOTO:

natalie portman dior ad banned

UPDATE: This article has been updated to reflect new information about L'Oreal UK's involvement and the specifics of the ASA's verdict. See the ASA's response in full here.

See more adverts that got the axe:

Loading Slideshow...
  • American Apparel April 2013

    The ASA claims a complainant stated that the ads made the models appear "vulnerable" due to their positions.

  • American Apparel April 2013

    The ASA claims a complainant stated that the ads made the models appear "vulnerable" due to their positions.

  • 2011 Roger David ad

    The ASA said it “inappropriately depicted a young girl in a sexualised manner.”

  • Ryanair

    The ASA <a href="http://www.huffingtonpost.com/2012/02/15/banned-ryanair-ad_n_1279529.html?1329336365" target="_hplink">banned these Ryanair ads in February 2012</a>, deeming them too "sexually suggestive" to run in newspapers.

  • Drop Dead clothing line

    Banned in November 2011 for<a href="http://www.huffingtonpost.com/2011/11/10/drop-dead-ads-banned-asa_n_1085903.html" target="_hplink"> showing an "underweight" model</a> and sending an "irresponsible" message.

  • Marc Jacobs Oh, Lola!

    Banned in November 2011 for <a href="http://www.huffingtonpost.com/2011/11/09/dakota-fanning-perfume-ad-banned-marc-jacobs_n_1083535.html" target="_hplink">its potential to "sexualise a child."</a>

  • L'Oréal's Revitalift Repair 10

    Banned in February 2012, for "misleadingly exaggerated the performance of the product," i.e. smoothing over Rachel Weisz's skin with technology, not makeup.

  • Marks & Spencer lingerie

    Banned in November 2011 for <a href="http://fashion.telegraph.co.uk/news-features/TMG8924873/Marks-and-Spencer-lingerie-advert-banned-for-being-too-sexy.html" target="_hplink">showing ''objectified women''</a> and images that are ''sexually suggestive'' and likely to be seen by children.

  • Lynx Deodorant

    Banned in November 2011 for being <a href="http://www.huffingtonpost.com/2011/11/26/banned-deodorant-ads-uk-lucy-pinder-lynx_n_1113958.html?1322660080" target="_hplink">"sexually suggestive, indecent, provocative."</a>

  • Miu Miu Fall 2011

    Banned in November 2011 for <a href="http://www.huffingtonpost.com/2011/11/23/hailee-steinfeld-miu-miu-ad-banned_n_1109948.html" target="_hplink">its setting, on a rail road track, being "irresponsible."</a>

  • Lancome

    Banned in July 2011 for <a href="http://www.huffingtonpost.com/2011/07/27/julia-roberts-loreal-ad-ban_n_910587.html" target="_hplink">"excessive retouching."</a>

  • 2012 United Colors Of Benetton "Unhate" Campaign

    Two world leaders making out? That's bound to get banned.

  • American Apparel Models

    Again, American Apparel gets in hot water when they apparently use underage models (girls younger than 16) on their website. Britain's ASA <a href="http://www.huffingtonpost.com/2012/12/05/american-apparel-sexy-ads-asa-child-models_n_2243360.html#slide=1805970" target="_blank">accused the store of "sexualizing" underage models. </a>

  • Maybelline's The Eraser

    Banned in July 2011 for "excessive retouching."

  • Angelina Jolie

    Two of Universal Studios' posters for "Wanted," starring Angelina Jolie, were banned because of her seductive pose with a gun. The ASA felt it glamorized violence.

  • Yves Saint Laurent's Belle D'Opium fragrance

    Banned in February 2011 for suggesting <a href="http://www.huffingtonpost.com/2011/02/02/ysl-belle-dopium-ad-banne_n_817455.html" target="_hplink">"the injection of opiates into the body."</a>

  • American Apparel Ads

    Some of American Apparel ads (including the one above) were banned by Britain's ASA for gratuitous nudity; a few more were deemed "exploitative" for sexualizing young women. (American Apparel photo)

  • Lara Stone for Calvin Klein

    In 2012, Lara Stone posed with a group of male models in this Calvin Klein ad. It was <a href="http://www.huffingtonpost.com/2010/10/21/calvin-klein-billboard-ba_n_771559.html" target="_blank">promptly banned by Australia's Advertising Standards Bureau</a> after they found it to be "suggestive of violence and rape."

  • Bulgari's Julianne Moore Ad

    This ad was pulled in Italy in 2011 after the mayor of Venice found it inappropriate.

  • Rimmel's Mascara Ad

    The British Advertising Standards Authority (ASA) <a href="http://www.huffingtonpost.com/2010/11/26/why-was-this-georgia-may-_n_788605.html" target="_blank">banned this ad after they declared it misleading</a> because Georgia May Jagger is wearing false eyelashes -- even though there's a small disclaimer at the bottom that says, "show with lash inserts."

  • 2005 “Last Supper” Marithé & François Girbaud ad

    This was banned in France.

  • Brian Atwood's Madison Avenue Ads

    The <a href="http://www.huffingtonpost.com/2012/08/23/brian-atwood-ads-banned_n_1824162.html" target="_blank">video of this ad was banned from taxis and the print versions were banned</a> from the facade of Atwood's Madison Avenue store after being found to be too racy.

  • Natalie Portman for Dior

    The Advertising Standards Authority<a href="http://www.huffingtonpost.com/2012/10/23/natalie-portman-dior-ad-banned-mascara_n_2004837.html" target="_blank"> banned this ad </a>because they felt the ad used excessive "post-production retouching" in order to exaggerate the real effects of the mascara being advertised.

  • Tom Ford's Gucci Campaign

    In 2004, this Tom Ford Gucci ad campaign became controversial as women saw the girl's shaved pubic hair as degrading and wrong.

  • Eva Mendes (NSFW)

    Eva's 2008 commercial for Calvin Klein's "Secret Obsession" fragrance was banned, due to the fact that it featured a <em>major</em> wardrobe malfunction.

  • Ashton Kutcher

    Kutcher's online ad for PopChips was banned after it was considered racist by the Indian-American community.

  • Another Eva Mendes

    A PETA ad, featuring hot women and supposed-to-be "sexy" veggies, was banned from the Super Bowl ad lineup in 2010 for being "too much" for TV.

  • Tom Ford 2007

    We don't think we really need to explain why this ad was banned...

  • Rachel Weisz for L'Oreal Paris

    This ad was banned after a complaint from Liberal Democrat Jo Swinson who claimed the ad was "misleadingly exaggerated" in that is makes Weisz look far younger than she actually is and presents a bad image for women.

  • American Apparel Sock Ad

    Oh American Apparel, how you love to push the envelope. Here's another one that was banned because the ad is supposed to be promoting socks but it seems more to be exploiting the girl instead.

  • Taylor Swift for CoverGirl

    This Taylor Swift mascara ad was <a href="http://www.huffingtonpost.com/2011/12/20/covergirl-mascara-ad-banned_n_1159957.html" target="_blank">banned by the National Advertising Division of the COuncil of Better Business Bureaus Claims (NAD)</a> after they found the product depiction to be dishonest with it's claims that the mascara will make lashes have "2X more volume" and be "20 percent lighter."

  • Paris Hilton

    Like Kim's, Paris Hilton's 2005 Carl's Jr. commercial was considered too racy, as well.

Want more? Be sure to check out HuffPost Style on Twitter, Facebook, Tumblr, Pinterest and Instagram at @HuffPostStyle.