Emma Stone arrived in jeans, but quickly slipped into a very sexy, little black Azzaro minidress and sky-high Brian Atwood pumps for her appearance on The Late Show With David Letterman in NYC yesterday. Emma was there to promote The Help, which hits theaters next weekend, but talk also turned to her current big-screen comedy Crazy, Stupid, Love. Emma revealed the details of passing her "chemistry test" with Ryan Gosling to land the part, which apparently included trying out the Dirty Dancing lift they perfect in the film. Emma also spoke about attending a recent screening of The Help at the White House hosted by Michelle Obama. At the first lady's request, Emma sat in the front row to watch her own performance and joked that she has one request for the next White House screening — booze. Emma was up bright and early this morning to continue her rigorous press tour, though she's rumored to somehow still be sneaking in time for romance with her Amazing Spider-Man costar Andrew Garfield.