William & Kate Celebrate Prince Philip's 90th Birthday

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Jun. 12 2011, Published 9:30 a.m. ET

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by Radar Staff

Another day, another hat. Kate Middleton and Prince William attended a special church ceremony Sunday morning, part of the celebration of Prince Philip turning 90.

Philip turned 90 on Friday, and today he and his wife of 54 years, Queen Elizabeth, came together with 750 of their closest friends to celebrate at Windsor Castle.

William and his brother Harry reportedly became quite close to their grandparents after the death of their mother Diana, and they've welcomed Kate right into the family.

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