09/12/2011 16:11 GMT | Updated 22/05/2015 10:12 BST

Battle Of The LBDs: Nicole Richie, Diane Kruger &Amp; Joan Collins At The UNICEF Ball

A whole host of stars descended on the Beverly Wilshire in California last night for the annual UNICEF charity ball - and we couldn't help but notice a definite mini-trend in glam black evening gowns...
Diane Kruger also upped the style ante in a backless

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