Britney Spears is ready to embark on her North American Femme Fatale Tour next week with Nicki Minaj, and the 29-year-old pop star is letting 'Entertainment Tonight' in on all of her road secrets.

"I'm really excited," she says in the first half of the two-part interview. "I'm probably going to be extra nervous the day before, but we've been working hard for two months now and everything is coming together really good, and I'm just excited right now."

The epic show takes plenty of stamina to get through every night, but the Louisiana native has been busy prepping for the task. "Especially when you're on stage and you're on your eighth number, you're like, 'Oh my God,'" she says. "You get really winded and you're like, 'How can I do the rest of this show?' But I've been training for a while, and before I come to rehearsals I've been working out and stuff like that, so I won't have that predicament."

To make it through the long bus rides, Spears says her pillows and 'Sex and the City' DVDs are essential, but her two most precious must-haves are her children, who travel on tour with her. However, Sean Preston and Jayden James have a hard time processing their mom's celebrity.

"They're really confused with mommy the star and mommy, so it's really interesting to see," she says, adding that her sons ask, "'Is that Britney Spears, or is that you mommy?' and I'm like, it's the same person! It's really sweet."

The Femme Fatale Tour kicks off on June 16 in Sacramento, Calif., and will make its way through the U.S. and Canada over the next two months, before wrapping up on Aug. 14 in Toronto. Spears will then have a few weeks off before heading out on her European dates.

Watch Part One of Britney Spears' 'Entertainment Tonight' Interview

Watch Part Two of Britney Spears' 'Entertainment Tonight' Interview