Trying to lose weight for graduation!!

As the title says, I'm in a mad dash to look great in my graduation dress. At my school there's a gorgeous ceremony, all the girls wear white and the boys wear blue blazers etc., there are a million pictures taken on a bright, sunny lawn, I want to look radiant and confident when I walk up to the podium, and could use some support in slimming down until the drop dead date in 2 months!!