Calling all Gleeks! En route to Monday's appearance on the Late Show with David Letterman, the series' blonde sweetheart (and May MC cover girl!) turned up in Stella McCartney's velvet peplum dress from Fall 2011. With its impeccable cut and subtly detailed bodice, the frock fits Dianna's physique and feminine style sense perfectly.
Bonus points for the star's styling choices, too—those newly-shorn locks look lovely when curled, and the bright pink lipcolor makes for a bold finishing touch. A definite Quinn-er in our book.