TAKE FIVE: Talk about a lengthy rehearsal. During a press conference Sunday for the Cannes film festival’s closing film, “Coco Chanel & Igor Stravinsky,” Anna Mouglalis – who plays Coco Chanel – said she’d been in preparation for the role since entering the fashion house as a muse eight years ago. “I got to spend so much time in (Chanel’s) apartment, I took siestas on her canapé — filled her ashtray,” quipped the actress, who later took to the red carpet in a custom-made Chanel dress by Karl Lagerfeld. He had whipped up an emerald satin bustier dress a la Eva Gardner, whom Mouglalis resembles, according to Lagerfeld. Among the festival’s award-winners, meanwhile, Charlotte Gainsbourg was named best actress for her daring performance in Lars von Trier’s extremely graphic movie “Antichrist.”