 Cooper Anderson ( Matt Bomer ) , Blaine 's ( Darren Criss ) older brother and an actor in television ads , visits McKinley High and is treated as a celebrity by Blaine 's boyfriend Kurt ( Chris Colfer ) and Sue . Blaine is unhappy , though , when after he and Cooper do an impromptu mashup of two Duran Duran songs in the choir room , Cooper finds fault with Blaine 's singing . Sue recruits Cooper to give an acting master class for the club , which contains such bad advice that Blaine is appalled . Worse , Cooper subsequently criticizes Blaine 's acting in a class scene . 
