HOLLYWOOD, Calif. — Britney Spears is sweating up a storm.
In new photos posted on her Web site, fans catch another glimpse at the 27-year-old singer's rehearsal sessions as she prepares for her upcoming "Circus" concert tour.
Spears has shed a reported 20 pounds in recent months by cutting her diet to 1,200 calories per day. That's in addition to a rigid cardio-and-strength-training program, on top of her dance rehearsals.
"I have had to work hard at getting [my body] back to where it used to be," she revealed in January's Glamour. "I used to be obsessed with working out ... But I can't get motivated right now because I'm so focused on my music."
Spears kicks off her world tour on March 3 in New Orleans, along with special guests The Pussycat Dolls.
Buy tickets for the Britney Spears "Circus Tour"
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