Fashion designer Zac Posen could soon be working for Martha Stewart. Posen bid $3,500 and won a six-week internship at her company at the Martha Stewart Center for Living at Mount Sinai gala Wednesday night. Other guests included honorees James and Alexandra Lebenthal, Le Cirque’s Sirio and Marco Maccioni, Macy’s Terry Lundgren, Marjorie Gubelmann, Richie Notar and Muffie Potter Aston. All proceeds went to the center, which Stewart launched in honor of her mother. Posen tweeted, “I’m so happy that I won a 6 week internship with @marthastewart. Whatever will I learn?”