Fresh off the heels of last week's Met Gala, the fashion set was back at it again. This time, our favorite trendsetters hit The Metropolitan Opera House for American Ballet Theatre's Opening Night Gala. While last week's festivities called for daring couture numbers, it was all about simple, chic and sophisticated looks on Monday night. Given that the evening was hosted by Lanvin, everyone from Emmy Rossum to Karlie Kloss did an amazing job representing Alber Elbaz's designs. Click through to see our picks for the top 10 looks of the night!