Katy Perry Spits Out Her Cherry Pie While Promoting 'Bon Appetit'

Katy Perry has officially lost her appetite for cherry pie ... she literally can't stomach another bite.

Katy was out pumping up her new single, "Bon Appetite" this weekend at the Wango Tango concert in Carson, CA -- and noshed on a big ole cherry pie. It's been her big promo gag lately for the song.

Unfortunately, Katy has her limits when it comes to snacking on pie ... and this time she spit it out with a very grossed out look.

Must not have been her recipe, but that face is priceless.