The 26-year-old is currently touring the world with the show and her new single Last Friday Night will be released in July.
However it's claimed her lack of booze on the tour means she will be celebrating with an alcohol-filled party once the tour is over.
She said to UK newspaper Daily Star: 'I'm pretty boring on the road because I save it all for the stage, so I'm on a strict vitamin diet. But when the tour is over I'm going to be a devil and hit a wild streak.
'I'll be face down in the porcelain. I can't eat spicy food or dairy because they're bad for your voice. I can't even do coffee. So you'll find me staring at the white wine in the fridge backstage.'