By Jennifer Armstrong
Updated October 27, 2010 at 03:26 PM EDT

Image Credit: Michael Yarish/FoxPerhaps the most-debated part of Glee‘s Rocky Horror-themed episode last night was the opening number: the unidentified pair of lips singing “Science Fiction.” We’ve done some investigating and can now tell you for certain that those perfect red lips belong to none other than Santana. Not Quinn (as I suspected). Not Tina (as others suspected). Fox has just confirmed the news to us. You’re welcome.