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InStyle's editorial guidelines Updated on January 29, 2010 @ 02:09PM Pin Share Tweet Email Photo: Gary Gershoff/WireImage Stars Fete Their Fashion Designer Friends 01 of 15 Lazaro Hernandez, Leighton Meester and Jack McCollough Billy Farrell/Patrick McMullen Leighton Meester joined Proenza Schouler designers Jack McCollough and Lazaro Hernandez at the Sundance Channel's premiere of The Day Before in N.Y.C last September. The four-part documentary followed the pair, along with designers like Karl Lagerfeld, in the final 36 hours leading up to their Fall 2009 runway shows. 02 of 15 Blake Lively and Anna Sui Charles Sykes/AP Photo Gossip Girl star Blake Lively congratulated designer Anna Sui at the September 2009 launch party for her Anna Sui for Target line in New York City. The collection was inspired by the preppy-chic characters on the hit TV show. 03 of 15 Charlize Theron and Vera Wang Kevin Mazur/WireImage Oscar winner Charlize Theron (here with designer Vera Wang) played host at the unveiling of the new designer floor at Saks Fifth Avenue in New York City last fall. The 50,000 square-foot space is the home of 23 designer shops, including Oscar de la Renta, Carolina Herrera and Vera Wang, of course. 04 of 15 Dries van Noten and Maggie Gyllenhaal Andrew H. Walker/Getty Images Last September, Belgian designer Dries van Noten and fashion-loving actress Maggie Gyllenhaal attended the Fashion Institute of Technology's 4th Annual Artistry of Fashion Award Luncheon at Cipriani 42nd Street where van Noten was honored with the Couture Council Award for Artistry of Fashion. 05 of 15 Zac Posen and Rachel Zoe Kevin Mazur/WireImage Designer Zac Posen and celebrity stylist Rachel Zoe struck matching poses at a fashionable Saks Fifth Avenue event last fashion week. Posen, Marc Jacobs and other top designers created exclusive one-of-a-kind cocktail dresses specifically for the fall 2009 launch of the new third floor. 06 of 15 Giuseppe Zanotti and Victoria Beckham Patrick McMullan Bergdorf Goodman hosted pals Giuseppe Zanotti and Victoria Beckham at their Fashion's Night Out event. Posh made her mark, signing T-shirts for eager fans in a Giles corset dress and over-the-knee Gucci boots. 07 of 15 Michael Kors and Debra Messing Mike Coppola/Getty Images The sweet smell of success! In September, Debra Messing joined Michael Kors for the Macy's Herald Square launch of the designer's fragrance, Very Hollywood. The actress walked an appropriately red carpet in a single-shoulder dress by the Project Runway judge. 08 of 15 Emmy Rossum and Carolina Herrera Bryan Bedder/Getty Images Always-elegant designer Carolina Herrera posed backstage at her Spring 2010 fashion show with actress and fan Emmy Rossum. "I just love her aesthetic and was lucky enough to wear one of her designs to the MET ball," said Rossum. 09 of 15 Janet Jackson and Marc Jacobs Seth Browarnik/Startraks Photo Janet Jackson celebrated with Marc Jacobs at his after-party hosted by Belvedere Vodka and V magazine last September. Other stars to stop by Hiro and fete the designer included Lindsay Lohan, Ciara and Rachel Zoe. 10 of 15 Dean Caten, Hilary Duff and Dan Caten Brian Zak/Sipa Press Hilary Duff helped DSQUARED2 design duo Dean and Dan Caten celebrate the launch of their eyewear collection during 2009's fall fashion week in N.Y.C. 11 of 15 Naomi Watts and Tommy Hilfiger Jemal Countess/WireImage Naomi Watts made a stop by Bryant Park last fall for the Tommy Hilfiger fashion show. "I'm wearing Tommy indeed, and its a bit risque for me!" Watts said of her sexy, open-back dress. 12 of 15 Thandie Newton, Francisco Costa, Kerry Washington and Rose Byrne Astrid Stawiarz/Getty Images Calvin Klein fans Thandie Newton, Kerry Washington and Rose Byrne headed to The Garden at The Standard Hotel to celebrate designer Francisco Costa and his Spring 2010 collection. 13 of 15 Christian Louboutin and Thandie Newton Dave M. Benett/Getty Images Thandie Newton crossed the pond for London's Spring 2010 shows where she met up with shoe designer Christian Louboutin at the Unique private dinner held at The Ivy. 14 of 15 Karl Lagerfeld with Katy Perry Eric Ryan/Getty Images After glamming up the front row at Karl Lagerfeld's Spring/Summer 2010 fashion show, Katy Perry headed backstage and greeted the designer with a congratulatory hug. 15 of 15 Reem Acra and Emmanuelle Chriqui Gary Gershoff/WireImage Designer Reem Acra greeted a sunny Emmanuelle Chriqui backstage following an intimate showing of her soft, feminine Spring 2010 collection.