10 / 10

AnnaLynn McCord

If it's cold enough in Santa Monica, California, for a heavy coat, knee-high socks, and fur-wrapped Uggs, perhaps "90210" minx AnnaLynne McCord should also be wearing some pants!

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What Were They Thinking?!

This week's worst-dressed stars include Katy Perry, Rihanna, and Vanessa Hudgens.