Kristin, who is mum to 11-month-old son Camden Jack, wore the black dress to the Hollywood premiere of new movie Clear History.
The star's sleeveless frock featured sheer triangular panels on the waist and she teamed it with a simple pair of pointed black courts.
Kristin wore long blonde hair wavy and in a centre parting and she kept her make-up simple, opting for brown eyeshadow and a glossy lip.
Although she now lives in Chicago with her son and American footballer husband Jay Cutler, Kristin flew to LA with Camden last week for a holiday/ business trip.
During her visit, Kristin has also hit back at critics who have accused her of being "too thin".
She tweeted: "Maybe people should stop judging. U don't know how much I eat or what I weigh so zip it!"
Before meeting her girl friends for dinner, Kristin later joked: "Off to dinner with my fav ladies. Hope they don't feed me too much!!! Need to stay SKINNNNY. Ha, had to..."