When Tatiana von Furstenberg wrote and directed the film 'Tanner Hall', it probably didn't hurt that she had a bit of professional help in the costuming department. For the flick, which stars Rooney Mara from 'Girl with the Dragon Tattoo', Tatiana relied on the expertise of her mother: none other than Diane von Furstenberg.

We're shocked that DVF has time to sleep, much less design onscreen attire for a movie, considering her position as head of the CFDA, all her humanitarian work and the responsibilities for her own collections. But it's refreshing to see that, no matter how famous a mother is, she always has time to support her daughter.

Monday marked the New York premiere of Tatiana von Furstenberg's first film, 'Tanner Hall', co-written and directed by her best friend, Francesca Gregorini. (That's right, Tatiana is Diane von Furstenberg's daughter.) The movie, a coming-of-age tale following four friends at a New England prep school for girls, features costumes by DVF and lists Rooney Mara, Brie Larson, Amy Ferguson, Amy Sedaris, Tom Everett Scott, Chris Kattan and Georgia King among the cast.

The film premiered at New York's Gen Art Film Festival, and it's being considered for the Cannes Film Festival next month. And late this summer, US audiences will be able to catch 'Tanner Hall' on the big screen. DVF tweeted after Tatiana's premiere: "I am proud of Tatiana and Francesca .. Movie played very well.. Cannot wait for the movie to open to the public!"