Britney Spears is gearing up for her Circus world tour, which kicks off March 3 in New Orleans.

"I rehearsed on the tour stage for the first time!" the singer posted on her Web site, BritneySpears.com. "It’s cooler than I imagined & has a lot of moving parts — can’t wait for you to see it!"

Look back on Britney’s career.

Also making a cameo: celeb blogger Perez Hilton, who will serve as a ringmaster in a video that plays before Spears hits the stage. Check out a screengrab to the left.

Spears has been hard at work. 

She just filmed the video for her raunchy song "If U Seek Amy" (say the title fast!), which she calls "super sexy." In the clip, the 27-year-old appears as a perfect 1950s housewife — and also a scantily clad seductress!

See Britney’s sexy bikini body. 

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