EDUCATING DITA: Mon Dieu. Skipping lessons to attend a fashion show? That’s exactly what Dita Von Teese did Monday morning, joining Yi Zhou, Mareva Galanter and Marie-Ange Casta at Alexis Mabille’s couture show Monday. “I should be in my French class right now,” confessed the burlesque star, adding she’s working on her beauty book, due for release at the end of the year. Actress Hélène de Fougerolles said she’s soon off to Africa to shoot an adventure film, while Casta kept mum about upcoming modeling projects.