Liberty Ross -- the wife of director Rupert Sanders who cheated on her with Kristen Stewart -- has already seen a divorce lawyer ... TMZ has learned ... but her goal is reconciliation.

We do not know which lawyer she hired, but the picture (above) was taken Tuesday in the lobby of a Century City office building in which a number of divorce lawyers practice -- including disso queen Laura Wasser.  By the way ... is Liberty hot or what?

Sources connected with the couple tell TMZ ... although Liberty has lawyered up, her end game is NOT divorce.   In fact, Liberty and Rupert have already been to a marriage and family therapist.  Our sources say, when they were photographed together on Tuesday in Beverly Hills (above), they were coming out of an office building where they met with the psychologist.