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Vanessa Hudgens

Courtesy: Denise Truscello/Wireimage

Vanessa Hudgens had beauty blogs buzzing over the blue and yellow eye makeup she wore to celebrate her 22nd birthday in Vegas this month. But she's not the only one with the blues…Diane Kruger, Kirsten Dunst and Hilary Swank have all been sweeping on the indigo shade recently. So what's gives?

A light blue pencil line on the inner rim of the lid makes eyes brighter and bigger, according to mystyle.com. Meanwhile, applying blue or turquoise on the upper lid flatters almost every skin tone and makes your eye makeup look fresh and fun. Sign us up!