Lupita Nyong'o is not only one of this year's breakout actresses, but a breakout fashion icon as well. Nyong'o frequently wears flirty and feminine looks from designers like J. Mendel, Moschino, and Miu Miu—she sat front row at the brand's Spring/Summer 2014 show. She's learned to bring her A-game to red-carpet appearances. From bright frocks to playful patterns, the 12 Years a Slave actress is a style star to watch. A look at her best pieces.