In the year of the selfie, even three world leaders can get away with the relatively new phenomenon–and at a memorial service, no less.At an event Tuesday marking the passing of Nelson Mandela, Denmark's Prime Minister Helle Thorning-Schmidt snapped a selfie with U.S. President Barack Obama and British Prime Minister David Cameron.A photographer at the event caught the moment. First Lady Michelle Obama could be seen sitting nearby, clearly not taking part in the photo op.(CNN)

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