The French actress, who's normally seen on our best-dressed list, is pictured here on the set of her latest film in New York City.
Marion Cotillard in character. Photo: PA
For the project, which is a yet to be named period piece also starring Joaquin Phoenix, Marion plays a Polish immigrant who is forced into prostitution and burlesque.
Marion Cotillard on set with co-star Joaquin Phoenix. Photo: PA
- Worst<p> 25 January: Tulisa at the National Television Awards 2012 in London</p> <p> A celebrity breakup is often accompanied by a big fashion or beauty statement, but we're not sure dressing like a flamingo is really the best way for Tulisa to celebrate her newly single status.</p> <p> </p>

- Best<p> 21 January: Alesha Dixon in Peter Pilotto steps out of The Lowry Hotel in Manchester</p> <p> Alesha's realised that <em>Britain's Got Talent</em> in the form of amazing labels like Peter Pilotto - she looks impeccable in this soft pastel frock and we can't wait to see what's to come.</p>

- Worst<p> 25 January: Lauren Goodger at the National Television Awards 2012 in London</p> <p> Yes, we know the Essex girls have a tendency to go all OTT with the fake bake and the glitz, but what bothers us the most about Lauren's look is how unflattering it is - this dress is a bizarre shape and does nothing for the reality star.</p>

- Best<p> 21 January: Kate Bosworth in Antonio Berardi at the <em>Black Rock</em> premiere during the 2012 Sundance Film Festival in Utah</p> <p> Another lady in red who looks gorgeous this week. Love how the lippy and shoes work with the dress even though they're slightly different shades of the bright hue. Valentine's Day inspiration, anyone? </p>

- Worst<p> 22 January: Kristen Bell attends the Bing and <em>Self </em>Magazine celebration and screening of <em>House of Lies</em> as part of the 2012 Sundance Film Festival in Utah</p> <p> Sure, it's snowy in Utah, but wearing snowboots to a party in your honour? It wouldn't even be such a terrible offence if Kristen hadn't thrown on the massive statement necklace to dress up her jumper and trousers - her outfit looks confused about whether it should be hitting the slopes or the event.</p>

- Best<p> 24 January: Katherine Heigl in Herve Leroux at the <em>One for the Money</em> premiere in New York City</p> <p> This body-hugging red frock is absolutely gorgeous on the star and she looks like Hollywood royalty. Va-va-voom!</p>

