"I'm challenging myself again, pushing my limits as I do, as a Scorpion does," she said.
The Firework singer is about to go back on tour and confesses that she believes this will be the best tour so far.
"I'm very excited because I believe this is my best work yet as far as live performances. It's going to be just as colourful and fun as before, but it's obviously not based on candy. It's grown up . It's more mature."
She also added that she has decided to start a new, and expensive hobby.
"I'm going to slowly become an art collector," Katy told E! at MOCA’s 35th Anniversary Gala.
"Today, we had an all-day art crawl. We got to see some private collections from some people's homes and then we went to a couple of galleries."