Watch! Official Music Video for "Party Girl," Featured on Pretty Little Liars Tweet February 25, 2011 by Rebecca Martin Related: Pretty Little Liars, Music , Season 1 Episode 18 Credit: Official McFly McFly's "Party Girl" was featured on Pretty Little Liars Season 1, Episode 18, when Alison and the girls arrive at the frat party. Check out the awesome music video for the song here!