The new hairdo comes four months after the 35-year-old actress welcomed her first daughter, Autumn. At the event she told People magazine that she "loves" her new hair.
“I was just inside with the baby and I felt like I was ready for a change," she explained. "As Giuliana Rancic says, I wanted to get my ‘momjo’ back! I got my mojo back, I wanted my ‘momjo.’”
In a separate interview at the event, Hewitt opened up to E! News about her struggles losing all the weight she gained during her pregnancy and how clothes have helped her feel better about it.
"I wasn't sure where I was going to fall and what was going to happen and how I was going to feel. It just feels great to sort of be honest about the fact that it is tough and these clothes make it a little easier, make me feel beautiful," she said.
Hewitt is currently married to her Client List co-star Brian Hallisay. The two wed last year after announcing they were engaged and expecting their first child in June 2013.