Two of the world's biggest pop stars met for the first time yesterday at the premiere of The Smurfs 2. Katy Perry  and Britney Spears  were so excited to meet one another, and Britney even hinted at an upcoming date in Vegas. We were on the blue carpet and saw all the action. Neil Patrick Harris  gave us clues about his upcoming Emmy hosting gig. Plus, Jayma Mays revealed what it was like to be at the private Glee memorial for Cory Monteith .