Hayden Panettiere's Halloween costume really is the cat's whiskers. The 25-year-old pregnant star took to Twitter on Friday to share a rather scantily clad snap of herself dressed up as a cheetah.

Hayden Panettiere is an American actress and activist. Most notably, Panettiere starred in the NBC television series Heroes as cheerleader Claire Bennet. She also received back-to-back Golden ...