‘Top Chef‘ is no stranger to celebrity guests. (Who can forget the Foo Fighters Thanksgiving? Or Natalie Portman’s vegetarian feast?) Wednesday night adds Joe Jonas to that list, as the young heartthrob stops by to give the chef’testants their latest Quickfire Challenge. But not everyone is familiar with JJ’s work. In fact, one cook thinks the JoBro is actually a pastry chef. Can you guess who?