(Cover) - EN Showbiz - Britney Spears has undergone a gruelling workout regime ahead of her new tour.

The singer launches her eagerly awaited Femme Fatale series of shows on June 16 in California. And Britney can't wait for it to begin after putting in so much effort during rehearsals.

"I'm really excited," Britney told Entertainment Tonight. "I'm probably going to be extra nervous the day before. We've been working hard for, like, two months now and everything's coming together really good.

"It can be kind of [gruelling], especially when you're on stage and you're on your eighth number. You get really winded and you're like, 'How can I do the rest of the show?' But I've been training for a while and I actually - before I come to rehearsals - I've been working out and stuff like that so I won't have that predicament."

While Britney is raring to go, she insists on having some home comforts while she is on the road. She is especially keen on having her favourite TV show on hand in case she gets bored.

"I love watching old episodes of Sex and the City. I can like be entertained on the bus. They are a must have," she laughed. (C) Cover Media