The singer radiates in an eye-catching Pucci ensemble at the Africa Rising concert in London. Plus: Justin Timberlake, Madonna, Jessica Alba and more

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Christina Aguilera looks like she stepped out of the 1960s in her fluorescent Pucci dress at the Africa Rising concert in London on Tuesday. The singer told PEOPLE at the event that she's already thinking of a sibling for 9-month-old son Max. "Absolutely, we'll definitely have more kids," she said.