The series, which stars and is executive-produced by Hewitt, will premiere 15 new episodes in 2013.
The Client List follows Texas housewife Riley Parks, who takes a job at a day spa after her husband leaves her. The role turns out not to be exactly what she expected when she learns that sexual favours are being offered there on the side.
"I couldn't be happier about Lifetime's decision to renew The Client List for a second season," the actress expressed in a statement.
"It has been so much fun working with such a great cast and crew on the wonderful stories we tell, and I'm ready to see where The Client List takes all of us next year."
The show also stars Cybill Shepherd, Loretta Devine, Kathleen York and Colin Egglesfield.
The Client List airs on Sundays at 10/9pm ET on Lifetime.
Watch a promo for The Client List (US only) below: