"You will never see a Frenchwoman on the street in yoga pants."

7:00 A.M. Like my grandmother, I wake up early. I'm always happy in the morning, so I get up easily. The first thing I do is put on music. I listen to things I can sing—French musicians like Françoise Hardy or Dalida. Before, I was a shower girl, but I just moved into a place on the Bowery in New York with a huge bathtub. I take a bath every morning and sometimes at night. I love shower gels from Molton Brown and Laura Mercier. She has all those scrubs and sugary things. One day it was horrible; I went to a meeting, and I had just used the Laura Mercier, and my boss was like, "Why does it smell like cotton candy in here?" I don't put makeup on in the morning, only at night when I go out. In the day I feel like it's cheating. I leave in my workout outfit, something I would never do in Paris. You will never see a Frenchwoman on the street in yoga pants.

7:45 A.M. I don't eat breakfast, but I grab a mocha at Bowery Coffee. I'm back on coffee! I used to rely on four coffees a day, but I've cut down a lot. When I came back I was like, Why did I live without that? It's just so good. The best is when you pair it with a cigarette.

8:00 A.M. I do Gyrotonic; I learned about it when I was dancing with Martha Graham. I think it's much better than Pilates. Then I take a quick shower. Getting dressed afterward is fast, about 10 minutes—I usually think about what I'm going to wear before bed. I wear a lot of Sonia Rykiel, but I mix it with things I've found at Browns. My dad and his family own it, so I'm very lucky. I mix and match with Valentino shoes and a Saint Laurent jacket or a Proenza Schouler sweater or something from Lanvin. I always wear earrings and rings. I don't wear necklaces or bracelets. I love my collection of vintage pearl earrings and new ones from Deszo by Sara Beltrán and Marie-Hélène de Taillac. I have about 10 pairs and a collection of 40 rings—my grandmother gives me a lot of her old ones.

9:00 A.M. I take a taxi to work and catch up on my e-mail. I try not to look at it before that. My first conversation of the day is usually with my family in Paris; we're all super close. Sometimes I bring a book with me, but I always end up Instagramming instead. I finally finished Karine Tuil's L'Invention de Nos Vies, one of my favorite books this year.

12:00 P.M. I usually have lunch out with editors or friends. Bergdorf Goodman is right in front of the office, so I go there often. It's dangerous because sometimes I'll end up shopping. Nobu is nearby as well. I also go to Amaranth or Candle Cafe. I don't like salad; I like fish and vegetables or steak. I like to have an animal—is that bad?9:30 A.M. I read everything—WWD, The New York Times, New York, The Daily, Le Monde. I need to know what's going on in France so I can keep up with my women. I receive maybe 200 e-mails a day. I screen them with my assistants, and then we make our plans for the day. We have a great atmosphere at the office. I try to have nobody wear makeup. I think it's cute—so French.

1:30 P.M. I have five or six meetings a day, discussing our plans and strategy and the preparations for the shows.

7:00 P.M. I go to an event or dinner almost every night. I keep heels at my desk to dress up my outfit. I love to eat at Omen, the Cleveland, Café Select, and Mercer Kitchen. And I like Sant Ambroeus. They just opened one in SoHo. In Paris, I go to Café de Flore—the food is not good, but it's the place to go. I see my boyfriend and my best friend every night. She lives really close by, so sometimes we'll meet for dinner or a drink. I go out six nights a week; I won't stay home unless I'm forced to. I don't really go out Sundays, but if I can I go to the movies because I hate watching TV. I think it's depressing.

11:00 P.M. To relax, I read or get massages or have hot chocolate with a cigarette. I have a massage guy who comes to my place once a week. Then I'll take a bath with essential oils and more Laura Mercier products.

12:00 A.M. My bedroom is really nice—it has floor-to-ceiling windows. My bed faces a window, and I have a great view of the Bowery. I have white sheets from a French brand called Descamps and some sweet pink-striped ones we did for Sonia Rykiel. I like to eat chocolate late right before going to bed. My mother sends boxes from La Maison du Chocolat, and I'll have it at random times, like the middle of the night. My boyfriend thinks it's a bad habit, so I try not to wake him up. —As told to Christine Whitney

By Christine Whitney on Mar 20, 2014 - Harpers Bazaar Magazine