Britney Spears is busy preparing for her Femme Fatale tour, but sat down with Entertainment Tonight to give a sneak peak of the rehearsals, and to talk about life on the road with the two most important men in her life: her sons.

"I'm really excited," Spears says about her upcoming tour, which kicks off on June 17. "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."

Spears tells ET that she's been "eating really clean," running to get her body into tour shape and preparing for life on a tour bus.

"As long as I have all the seasons [of 'Sex and the City'] with me, I can be entertained on the bus," she says of living on the road.