This week, we started a brand-new feature called Style Battle and kicked it off with Whitney Port vs. Olivia Palermo! Now, with Project Runway's finale tonight, we thought it would be fun to pin Heidi Klum and Nina Garcia against one another. But don't worry, it's merely a friendly style competition — the sassy Heidi against the sophisticated Nina. Just click through to see the fashionistas go head to head in their most Fab outfits, then vote for your favorite at the end. It's on!