Stephanie "Steffy" Forrester (formerly Spencer) is a fictional character from the American CBS soap opera "The Bold and the Beautiful." She is currently portrayed by Jacqueline MacInnes Wood. Steffy and her twin sister Phoebe (MacKenzie Mauzy) were born onscreen as the daughters of supercouple Ridge (Ronn Moss) and Taylor Forrester (Hunter Tylo) during the episode airing on September 21, 1999. For the character's first five-year period, she appeared as a minor. In 2005, Steffy was rapidly aged to a teenager and in 2008, she appeared as an adult when Wood took over the role.