It's the new phenomenon that's sweeping Hollywood -- guest starring on "Glee."
Actor and Broadway star John Stamos told "Extra" he's taking his upcoming guest appearance on the hit show very seriously.
"I'm singing and dancing everyday," the actor said. "I don't know what they are going to have me doing on there, but I really want to be prepared. I'm taking it like I got a job on Broadway."
Stamos calls the show a "blessing." "It's one of those blessings that come around every once in a while. I'm so excited. People are so excited about this show," he said.