The summer heat takes all the glamour out of having long hair, since it feels sweaty on our necks—and blow drying becomes a gut-wrenching chore. But how many of us would actually shave it all off like Mena Suvari? The cut is for her new movie Garden of Eden, but still, that takes some serious bravery! Sinead, Britney and Demi have all done it, too. Would you?