Tiger Woods and Jon Bon Jovi

What's worse, Tiger Woods' seizure-inducing button down, or the fact that Jon Bon Jovi (despite looking hot for 50) still thinks he can pull off the whole sleeveless leather vest thing? Discuss!

Photo by Getty Images May 8, 2012

WHAT WERE THEY THINKING?!

From dismal derby day outfits to jaw-dropping plunging necklines, this week's worst-dressed celebs include Adrienne Bailon, Rihanna, and January Jones