Last night, “Victorious” star Ariana Grande and her brother Frankie watched Katy Perry in concert and got a chance to meet her backstage. So, what did Ariana think of Katy’s show? And what did Katy think of Ariana’s red velvet cupcake hair?

Here’s what Ariana Tweeted after the show:

Just met @KatyPerry! She told me that I look like the little mermaid & she was so sweet! This was definitely my favorite concert ever. ♥

Aw, how sweet. Are you a fan of Katy Perry? Do you think she and Ariana should do a song together?

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