EXCLUSIVE: Cheyenne Jackson, who has been recurring on NBC’s 30 Rock and on Fox’s Glee, has signed with ICM. Jackson, best known for his extensive Broadway resume, which includes stints in Finian’s Rainbow, Aida, Thoroughly Modern Millie and Xanadu, recently completed the indie The Green and will guest on the upcoming season of HBO’s Curb Your Enthusiasm. Jackson, who was at Innovative, continues to be managed by Courtney Kivowitz at The Schiff Co.