Britney Spears is struggling with the energetic dance routines on her Circus world tour, insiders claim.
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Britney Spears struggling with dance routines
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Britney Spears leaving the X Factor
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Britney Spears could face legal row over new single
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Britney Spears to perform on ``X Factor''
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Britney collapses during rehearsal
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Britney Spears reveals new album cover
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Britney spears taking meth
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Dancers are needed
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Britney to cancel Circus tour?
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Khloe Kardashian struggles in vain to lose weight --
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Michael Jackson pushes out Britney Spears
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Britney Spears to be featured in Blender magazine
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Britney Spears is going to trial
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Britney to perform on the X Factor
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Justin Timberlake challenged to dance off
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Britney Spears to release new album this year
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Dr. Phil criticized for visiting Britney Spears in hospital