A Little Black Dress for Every Occasion

While I'm looking through my closet for a dress to wear this weekend, I'm sitting here freaking out about how I don't have enough LBD options.  What?  When did this happen?  I remember a time when all I had was little black dresses!  So now I'm on a hunt for not one, not two, but three little black dresses.  It's important to have one for every occasion because you just can't go wrong with a little black dress. 

Which is your favorite of the bunch?