Crystal is a minor character in Fuller House. Crystal is Matt's former girlfriend. It is possible he is with her to make D.J. jealous. She is portrayed by Gianna DiDonato.

In the Fuller House season 2 official trailer, for a brief moment, it shows a clip showing both Matt and Steve telling D.J. that they both got new girlfriends (Steve's new girlfriend is C.J.), right before D.J. was about to announce who she finally chose. Once that is said, Kimmy whispers to Stephanie, "Geez, this poor girls life is a LifeTime movie waiting to happen!"