According to Vogue UK, and other sources ???Yucaipa, the company that owns Zac Posen, were becoming reportedly frustrated that the label wasn???t making enough return on its investment and decided on a new CEO to boost profits.??? This is in spite of the fact that Zac Posen???s designs have been worn by such celebrities as Kim Kardashian, Natalie Portman, Rihanna, Kate Winslet, Jennifer Lopez, Bey