Gaspard Ulliel

• The first promotional image from the soon-to-be-released Yves Saint Laurent biopic, Saint Laurent, starring Gaspard Ulliel, has been released. [Telegraph]
  

• J.Crew has launched an in-store styling app called Very Personal Stylist with tips and tricks to achieve that perfect Jenna Lyons look. [Refinery 29]
  

• Tiffany & Co. has filed a lawsuit with Costco, claiming that the wholesale retailer sold counterfeit rings under the Tiffany name for years. [Styleite]
  

• Kate Davidson Hudson and Stefania Allen, who left their respective positions of accessories director and senior accessories editor at Elle last year, have debuted Editorialist, a luxury accessories retail site. [WWD]
  

• After 33 years, Coach is getting a new CEO. Victor Luis will succeed the position Lew Frankfort has held starting January 2014. [Vogue UK]
  

• House of Holland has designed a four-piece capsule collection for eBay. All proceeds from the collaboration will benefit Cancer Research UK. [Vogue UK]
  

• Could Dauphine McKee be the next model to watch? The 17-year-old made her debut this season with more than 19 shows in New York, including Calvin Klein and Ralph Lauren. [Elle]
  

Those stories and more in our daily news roundup.

• Erin Heatherton and Leonardo DiCaprio have called it quits. "There's no bad blood," the source said. "They still care about each other a lot." In the 10 months they were together, the duo weren't photographed together much, but they did vacation in Australia late last year. [Us Weekly]
  

• French actor Gaspard Ulliel has been cast as Yves Saint Laurent in a biopic that will be directed by Bertrand Bonello. The yet-to-be-named film apparently does not have Pierre Bergé's approval, but another YSL film about Bergé's relationship with Saint Laurent, directed by Jalil Lespert, does. [Vogue UK]
  

• Karl Lagerfeld will release a line of watches, priced between $150 and $595, on Feb. 28. [Design Scene]
  

• Producers for the Victoria's Secret Fashion Show, which is being held in a National Guard building in New York this Wednesday, helped the Guard respond to Hurricane Sandy by letting the guardsmen use their generators and rented space and even setting up an Internet connection. [Fashionista]
  

• British label Ossie Clark is set for a comeback. It's been renamed Ossie Clark London, and its first new collection — with pieces priced between $80 and $300 — will appear in 45 Debenhams stores across the UK starting in February 2013. [Vogue UK]
  

• Amazon is setting up a 40,000-square-foot fashion studio in Brooklyn's Williamsburg neighborhood, where it will shoot clothing for its main website as well as for online retailers Shopbop and MyHabit, which it also owns. [Racked]

Heidi Klum, Karolina Kurkova, and Arizona Muse, among others, have revealed what they'll be wearing to Monday night's Met Gala.

Balmain designer Olivier Rousteing told Style.com that he'll be taking model Joan Smalls as his date. Anthony Vaccarello has confirmed he'll be accompanied by Anja Rubik. Jason Wu will attend with Karlie Kloss, and Haider Ackermann will walk the red carpet with Constance Jablonski.

The site has also confirmed another spate of pairings: Roland Mouret is taking Doutzen Kroes; Rachel Zoe and her husband, Rodger Berman, will attend with Karolina Kurkova; Erdem Moralioglu will dress Arizona Muse; and Thakoon Panichgul is taking actress Christina Ricci.

It has also recently been revealed that Heidi Klum will wear a "very very lacy and very very see-through" one-of-a-kind dress by Escada. Chanel's official attendee will be French actor Gaspard Ulliel, face of the brand's Bleu de Chanel fragrance.

Previously confirmed pairings include Alexander Wang and rapper Azealia Banks, who tweeted that she would perform at the Met Gala last week; Proenza Schouler's Jack McCollough and Lazaro Hernandez with Australian actress Isabel Lucas; and Joseph Altuzarra with Lana Del Rey. Coco Rocha will attend with her husband, James Conran, wearing a vintage dress by Givenchy.

The Met Gala will be live streamed for the first time from 6:30-8:30 p.m. EDT on May 7.

Update: Everyone from Sarah Jessica Parker to Giovanna Battaglia has decided what they're wearing tonight. Below, a list of everything we know so far:

• Kristen Stewart will wear Balenciaga and attend the Gala with Nicola Ghesquiere.
• Gwyneth Paltrow will wear Prada. Linda Evangelista will also wear Prada, and will attend as Miuccia Prada's date.
• Renee Zellweger will wear Emilio Pucci.
• Jessica Stam will wear Dior.
• Cameron Diaz will attend with Stella McCartney.
• Lauren Santo Domingo will wear Oscar de la Renta.
• Kate Upton will attend the gala with Michael Kors, who is also dressing Jessica Alba and Liu Wen.
• Sarah Jessica Parker and Lily Cole wil both wear Valentino.
• Amy Adams will wear Giambattista Valli Couture.
• Scarlett Johansson is wearing custom Dolce & Gabbana, but the house will also dress Bianca Brandolini d'Adda, Andrea Dellal, Giovanna Battaglia, and Marpessa Hennink.
• Brooklyn Decker, Liya Kebede, Rashida Jones, and Tory Burch will all wear gowns of Burch's design.
• Kristen Bell and Dee Hilfiger will both wear Tommy Hilfiger.
• Dree Hemingway will wear Topshop.
• Farida Khelfa will wear vintage Schiaparelli.
• Emma Stone will wear Lanvin.
• Stella Tennant, Poppy Delvigne, Astrid Bergès-Frisbey, and Sigrid Agren will wear Chanel.
• Claire Danes will attend the gala with her husband Hugh Dancy and Gilles Mendel. She'll wear J. Mendel, and so will Aerin Lauder and actress Christine Taylor. Taylor will attend with her husband Ben Stiller.
• Burberry will be dressing Cara Delvigne, Jourdan Dunn, Gabriella Wilde, Vanessa Kirby, Douglas Booth, Mario Testino, Casey Affleck, and Roo Panes.
• Prabal Gurung is dressing Greta Gerwig.