Talk about Hollywood royalty! Regal purple satin is the latest fabric to adorn red-carpet princesses. "I love feeling womanly," Anne Hathaway told In Style. In her formfitting Dolce & Gabbana bustier dress (also donned by Fergie), Hathaway lived up to her promise. Those who want to follow her lead must think fit—a too-small satin dress will accentuate every lump and bump. "[Hathaway] still likes being Cinderella for the night," stylist Rachel Zoe has said. Well, if the glass slipper fits....

BUY JENNIFER GARNER'S PURPLE DRESS NOW
Derek Lam silk kimono dress, $1690; at net-a-porter.com.

—Betony Toht