Catherine, Duchess of Cambridge holds Prince George of Cambridge as...

Catherine, Duchess of Cambridge holds Prince George of Cambridge as they visit the Bilby Enclosure at Taronga Zoo in Sydney, Australia, on April 20, 2014. Credit: Getty Images / Chris Jackson

England's Queen Elizabeth II was among the royal guests at her great-grandson Prince George's first birthday party Tuesday, People magazine reports. The Queen arrived at Kensington Palace, the home of the tyke's parents, Prince William and Kate Middleton, around 4 p.m. local time and remained for 50 minutes, the magazine said. Other guests included George's maternal grandparents, Carole and Michael Middleton, and their children, Pippa and James; godparents Zara and Mike Phillips and their daughter Mia; the parents' private secretary, Jamie Lowther-Pinkerton; and Kate's friend Emilia Jardine-Paterson. Paternal grandparents Prince Charles and Camilla Parker-Bowles were away visiting Scotland this week.

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