This year, millions of you have tried on your favorite celebrity hairstyles using our Hollywood Makeover tool. Now we want you to decide which star should be crowned Best Tressed of 2010! While Justin Bieber's side-swept bangs and Lady Gaga's faux hair bow have been big hits, follically-blessed stars like Jennifer Aniston, Beyonce and Katie Holmes lead the list of all-time favorites. We've narrowed the field down to the top 10 hair try-ons of 2010, and now it's up to you. Browse photos of the finalists, then head over to InStyle's Facebook page to give your favorite the thumbs up. The star whose photo has tallied the most likes by 6 p.m. EST this Friday will be declared the winner. Plus, one lucky InStyle Facebook fan will be chosen at random to receive a goody bag full of the hottest hair care products featured in our November issue. Cast your vote now for your chance to win!