"I think he's going to be Dianna Agron's new love interest," cast member Matthew Morrison said. "His name is Biff. He's kind of a Yalie degenerate."
E! said it is unclear whether Crawford will sing during his appearance.
Previous guest stars Gwyneth Paltrow and Kristen Chenoweth are also booked to guest star on the two-part episode, which is set to air March 18 and 25.
2014: The Year in Music [PHOTOS]