Which actress portrayed Stephanie's friend Gia Mahan?

Marla Sokoloff portrayed Stephanie Tanner’s friend Gia Mahan in Full House.

Gia first appeared during the show’s seventh season as a rebellious teenager and initially acted more like Stephanie’s dangerous influence than her friend. Her storylines involved teenage peer pressure, including the episode “Fast Friends,” where smoking becomes a major concern.

Over time, Stephanie’s influence helps Gia mature, improve her grades, and stop smoking. The relationship gradually changes from rivalry and bad influence to genuine friendship. Gia later returns in Fuller House, where viewers learn she has a daughter, Roxanne “Rocki” Mahan.

A common mix-up is Andrea Barber, who played Kimmy Gibbler, D.J.’s longtime best friend. Kathryn Zaremba played Irene, while Jurnee Smollett appeared as Denise Frazer. None of those actresses played Gia.