I hope that this catches on.  Sometimes when you get too many people in a room at a concert, the smell can get a bit....extreme.  Katy is looking to change that.

KATY PERRY wants her upcoming California Dreams Tour to be arty and crazy . . . kinda like LADY GAGA and PINK'S shows . . . and if that's what she's going for, it sounds like she's on the right track.

She says, quote, "I have this whole thing in my show that is about candy and cupcakes and meat. It's both really sweet and shocking, but not in a sexual way."

Katy is also introducing something called "smell-o-vision."

She explains, quote, "It's the first concert that's going to smell good. It's going to smell like you're in cotton candy heaven. It's a fun little nuance." (--Unfortunately, Katy didn't elaborate any more on "smell-o-vision.")

--Katy adds, quote, "I just really want to raise the bar. Touring is no longer an ordinary thing where you play an instrument in jeans and a T-shirt.

"It has some pizzazz these days, and I'm definitely bringing the pizzazz with a lot of bells and whistles. The show has a Broadway feel to it. It's got a storyline that's going to be very interesting, kind of loosely based on my life, but a cartoon version."

Katy's world tour begins next month, but it won't hit the U.S. until June 7th. You can see her full itinerary at her website, here.