Holly Holliday

Holly Holliday (Gwyneth Paltrow) is a substitute teacher at McKinley High. Her first appearance was in "The Substitute." In it she temporarily takes over as the director of the New Directions while Will Schuester was out sick. Paltrow's Glee appearance marked her first ever scripted-series guest performance. The role of Holly was created for her by series creator Ryan Murphy, a personal friend who suggested that she showcase her vocal and dancing talent ahead of the December 2010 release of the film Country Strong, in which Paltrow plays a country singer. Holly makes a return appearance in the episode "Sexy" as McKinley's new sex education teacher, in which it is revealed that she attended an all-women's college. In that same episode she also begins a romantic relationship with Will. Holly's last Season 2 appearance was in the episode "A Night of Neglect," where she sings "Turning Tables" by Adele at the benefit and breaks off her relationship with Will because she knows he is in love with Emma. On March 17, it was confirmed that Paltrow and her character will return for a series of guest appearances in the show's third season. In the first season Finn mentions Gwenyth Paltrow named her child Apple when he and Quinn debate on what to name their baby.

Information from Wikipedia