Katy Perry performing at The Liverpool Echo Arena 21st May 2014Katy Perry performing at The Liverpool Echo Arena 21st May 2014Katy Perry performing at The Liverpool Echo Arena 21st May 2014Katy Perry performing at The Liverpool Echo Arena 21st May 2014Katy Perry performing at The Liverpool Echo Arena 21st May 2014Katy Perry performing at The Liverpool Echo Arena 21st May 2014Katy Perry performing at The Liverpool Echo Arena 21st May 2014Katy Perry performing at The Liverpool Echo Arena 21st May 2014Katy Perry performing at The Liverpool Echo Arena 21st May 2014Katy Perry performing at The Liverpool Echo Arena 21st May 2014Katy Perry performing at The Liverpool Echo Arena 21st May 2014Katy Perry performing at The Liverpool Echo Arena 21st May 2014Katy Perry performing at The Liverpool Echo Arena 21st May 2014Katy Perry performing at The Liverpool Echo Arena 21st May 2014Katy Perry performing at The Liverpool Echo Arena 21st May 2014