The North American leg of her Back to Basics 2007 tour is still as couple weeks away, but Christina Aguilera says she's already looking further into her future.

The North American leg of her Back to Basics 2007 tour is still as couple weeks away, but Christina Aguilera says she's already looking further into her future.

"I'm already exploring new ideas for what the next look is and what the next sound will be, which I'm really excited about," Aguilera said on a conference call yesterday (Feb. 6). "I have to put it on the back burner and finish with the tour, but I definitely have ideas for the next (project)."

But, she added, "I can't give away what they are. There always has to be that element of surprise and really giving my audience something to be excited about for next time. What I can tell you is, yeah, I am extremely driven. It'll always be inside of me to keep that focus ... of bettering myself and constantly evolving and changing and seeing what the next time has to offer."

Aguilera did let on that she does have acting ambitions. "Like music, it's another art form I want to take seriously," she explained. "I've been reading scripts and whatnot. I want to make sure it's the right role and, if I want to act, to do just that, not just play myself as a singer."

One of those places will be the Grammy Awards ceremony on Sunday in Los Angeles, where Aguilera is nominated for two trophies and will perform -- another secret that she promised will be "a special treat for everybody, including myself. It's something I've never actually performed anywhere before." She's also slated to sing at halftime of the NBA All Star game on Feb. 18 in Las Vegas -- two days before Aguilera kicks off her North American tour in Houston.

She'll visit 41 cities into early May with an extravaganza that includes 92,000 pounds of equipment, 10 costume changes, 820 pounds of confetti, several stage sets and a vintage carousel horse -- not quite "basics." "If I play an arena," she noted, "I don't think it would be fair to my audience to just kind of sit on a stage with a mic."

Off the stage, however, Aguilera said she'll continue plotting her next move. "When you're on tour you learn so much about yourself (and) have a lot of time for yourself," she said. "You get a lot of time to write, write in my journal, express myself, so by the time the next record comes around, I have a good idea of a head start of where to go next."

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