Hollywood's Top 18 Most Drastic Celebrity Haircuts (PHOTOS)

When we heard that Heroes star Hayden Panettiere (June 2009, left) chopped her wavy blonde locks (April 2010, right), we were a little concerned. Much to our surprise, the petite 22-year-old actress rocked the cut something fierce, giving us a valid reason to sit through that two-hour trainwreck also known as Scream 4.