When the celebs strut down the red carpet for their big premiere or award ceremony, their hairdo is as much a part of their look as their outfit. Check out the latest hairstyles and let us know whose hairdresser did the best and worst job.

Celebrities featured: Alexis Bledel, Angelina Jolie, Ashlee Simpson, Cassie, Eliza Dushku, Emily Didonato, Erika Christensen, Gabrielle Union, Jenna Dewan, Jennifer Connelly, Jennifer Morrison, Jessica Simpson, Jordana Brewster, Kara Dioguardi, Krysten Ritter, Maria Menounos, Megan Fox, Penelope Cruz, Renee Zellweger, Scarlett Johansson, Shenae Grimes, Sienna Miller.