Katie and Tom bring their high-flying little one to a dinner party in Rome. Plus: J. Lo & Marc, Michael Jackson and more

BUSINESS CASUAL

Pop star Christina Aguilera gets down to business Wednesday at London's Mayfair Hotel, where she held a press conference for her Back to Basics tour. "This is my most inspired tour yet," she told the assembled press about the circus-themed extravaganza featuring costumes by designer Robert Cavalli. The tour launches Friday in Sheffield, England, before coming stateside Feb. 20.