Pop superstar Katy Perry has revealed that in order to keep herself on top form for her upcoming 'Prismatic' world tour, she has stopped drinking alcohol. 

During a new interview with Australia's 'Sunrise' television programme, the 'Dark Horse' beauty explained that she's really watching what she eats or drinks because she needs to be as fit as she possibly can for her run of shows:

"I have to be very focused right now... I've cut out all alcohol and all fatty foods, a lot of dairies (sic), I go home and I'm gonna have mostly vegetarian with some protein on the side like some grilled chicken. I'm almost 30 guys, my body does not snap back any more. I can't go around eating McDonald's like I used to."

Perry also joked about her recent kiss with 'We Can't Stop' hitmaker Miley Cyrus and admitted that she doesn't know where her tongue has been: "I just walked up to her to give her like a friendly girly kiss, you know, as girls do, and then she like tried to move her head and go deeper and I pulled away. God knows where that tongue has been. We don't know! That tongue is so infamous!"

Watch footage from Perry's 'Sunrise' interview here: