shared dinner with a girlfriend at Tortilla Republic in West Hollywood on Monday.
Wearing a black blouse, blue jeans and high heels – while sporting her new short dark hair style – the Snow White and the Huntsman
actress and her friend ordered up huarache hongos flatbread, housemade guacamole and jalapeño Margaritas.
Theron – who is mom to son Jackson
– seemed to be enjoying her down time.
"She was relaxed and in a good mood," an onlooker tells PEOPLE.
– Jennifer Garcia