Star Tracks

Roberts shows off her big-city spirit. Plus: Christina Aguilera, Nicole & AM, Sheryl Crow and more

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ON CALL

Christina Aguilera does her best pout as the new spokeswoman for Orange Sony Ericsson phones Friday in London, where she also found an unlikely fan: Tony Blair. On the chat show Parkinson, the prime minister confessed that he downloaded some of her hits.

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