The 'I Wanna Go' star will kick off her global tour in the US on June 16, while the 'Femme Fatale' production will visit the UK and Ireland later in the year, with a string of dates already confirmed for Belfast, London, Birmingham and Manchester.
During her "revealing" interview with ET, Spears described what she needs to be "comfortable" while on the road travelling between various cities.
"My pillow from home," she laughed. "I have to have my pillow!"
Spears continued: "I love watching old episodes of Sex and the City. As long as I have all the seasons with me, I can watch and be entertained on the bus. That's a must-have!"
Discussing her current diet while preparing to take to the stage again, she admitted: "I eat really clean right now. I have an instructor that travels with us and he's going to be on the road with me. He actually does a lot of my meals and stuff like that for me too, so it's just really clean."
> Britney Spears explores 'Femme Fatale' tour stage: Video
Watch Britney discuss and rehearse for her tour on ET below: