Rating: 4 out of 5by omgily123 on 8/9/10Gibson Amphitheatre at Universal CityWalk - Universal CityKaty Perry was a great host. Her performance, Jason DeRulo, Bruno Mars, Travis McCoy, and Diddy's all were excellent; as well as the Step Up 3D dance rouotine. The only bad part was that the Teen Choice made seem like people like Taylor Swift and Justin Bieber were going to be there and he was going to really perform when really that was not true at all. It really did not please the crowd when they all found out that it was a recording. But overall it was really cool being in the same place as hundreds of celebrities. The effects and staging was really nice as well.