What she means: Selena Gomez guest starred on Hannah Montana as pop star/rival Mikayla Skeech in three separate episodes. But she also was Alex Russo in Wizards of Waverly Place. We know that Wizards of Waverly Place and Hannah Montana take place in the same world because of the 2009 crossover special "Wizards on Deck with Hannah Montana". Both characters can't exist simultaneously unless Alex Russo created a pop star alter ego and used magic to never be recognized for it, yet this is never addressed and the series move on