The 18-year-old actress tweeted her excitement before and after the concert.
“Katy sounds amazing! This is my favorite concert ever. I love her. She’s such a great actress 2! I love that she has so much personality.. â™¥” Ariana started off. “Just met @KatyPerry! She told me that I look like the little mermaid & she was so sweet! This was definitely my favorite concert ever. â™¥”