Kesha, Ke$ha, Rihanna, Nicole Richie

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Every once in a while celebs step away from Hollywood's glamour and seem to follow the suggestion: "Let's get wild!"

For Rihanna this is a weekly occurrence and usually results in another new hairstyle. Yet, if we were going to pick her most shocking beauty look this year, it wouldn't include a cut or color change. It would, however, be the moment she decided to wear a blue statement lip to her River Island launch in London.

Wildest hair moment would instead go to Nicole Richie, who dyed her hair a gray-blue color for the 2013 Met Gala in New York City. Not surprisingly, the "Diamonds" singer was a fan of the look.

Runner up in the craziest hair color change category would most likely go to Ke$ha, who rocked rainbow hair earlier this month.

Tress transformations aside, there were plenty of eyebrow-raising looks including art pop nail art and bleached eyebrows. So in anticipation of seeing stars get even more wacky for Halloween we decided to take a look back at some of this year's wildest beauty moments. Click on to see what made our list.

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