The show stars That's So Raven's Raven Symone as Georgia, a performer from the South who moves to New York to try to succeed as an actress.
Deadline says that Delfino has now signed up to play Georgia's best friend Jo.
Jo is described as a "science geek" but is expected to move to New York with Georgia. The show also stars Brock Cuchna as Georgia's ex-boyfriend, who tries to persuade her to return home.
Delfino has previously had roles in Roswell High, Quarterlife, Men Of A Certain Age and the recent movie Life As We Know It.