"There might be a section that has some surprises," Katy told E! News in an exclusive interview. "We gotta keep ... through when I started my show at 9:15." (For more with Katy, tune into E! News ...

Katy Perry is hitting ... "A couple years ago, we were going through a little bit of a hard time medically in our family, and it was a little bit scary, and I started seeing 143 in many different ...