The former 'Sex and the City' star was hired as the Chief Creative Officer of a label, which she did not name, in January 2010. She quietly parted ways with the firm in July 2011, reported Aceshowbiz.
It now appears she probably did so because she was sidelined by more powerful male executives who were only interested in using her fame to front the brand.
"I was brought in to help run a fashion company for about a year (although I don't want to name names). I was shocked to experience an old-fashioned attitude about women and business: women had titles but were treated as figure heads.
She admitted that she struggled in silence, apart from seeking some advice from her representatives.
"I called my lawyer and agent on occasion. But I'm not a little girl; I can't call Mummy and Daddy all the time. If I take on a responsibility, I want to handle it with the authority given to me," she said.