glee dianna agron stella mccartney ysl tribtoo black lbd david letterman velvet

Photo: John P Iblis/

WHO: Dianna Agron
WHAT: The "Glee" gal opted for a Stella McCartney Rosalia bonded velvet dress with a sweetheart bodice and peplum flounce. She added matching YSL Tribtoo pumps.
WHERE: The actress -- who recently chopped off her locks -- was spotted visiting "The Late Show With David Letterman" on August 1 in New York City.

And don't forget to click through the gallery below for more looks: