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LONDON, UK (CBS) -- Photographs of British royal Prince George with his parents have been released to mark his first birthday on Tuesday.

The official photographs were taken earlier this month when his parents, the Duke and Duchess of Cambridge took him to a butterfly exhibition at London's Natural History Museum.

One image shows George fascinated by a blue morpho butterfly.

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The royals are expected to celebrate their son's first birthday with close family and friends at Kensington Palace.

Prince George is third in line to the throne, behind his grandfather Prince Charles and his father Prince William.

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