Emma Roberts shows off her cute, backless black Marni dress as she leaves for the 2010 Costume Gala Benefit in NYC on Monday evening (May 3).

The 19-year-old actress’s upcoming flick, 4.3.2.1. just got a release date for the UK — June 2nd! You can check out the teaser trailer here on JJJ!

The benefit, held at the The Metropolitan Museum of Art, will celebrate the opening of the “American Woman: Fashioning a National Identity” exhibition. Emma was in head-to-toe Marni.

Be sure to keep entering our newest contest where you can win Emma‘s Neutrogena look!

Photos: INFdaily, Getty

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