They've been around forever, but this season, the simple yet oh-so-chic headband is making a major comeback. So what has everyone from Rachel Bilson to Ashlee Simpson rocking the 'do-friendly accessory? "The new headbands are much more comfortable to wear," says Jennifer Behr, who designs her own line of hair accessories. "...And they are flattering--when your hair is pulled back, it highlights your eyes and face and makes your face look brighter and lighter."