Lupita Nyong'o is not only one of this year's breakout actresses, but also a breakout fashion icon. Nyong'o frequently wears flirty and feminine looks from designers like Peter Pilotto, Christian Dior, and Calvin Klein—she sat front row at the brand's Fall/Winter 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. Here's a look at her best pieces.