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Kate Middleton's younger siblings Pippa and James were spotted visiting their sister on Wednesday at King Edward VII Hospital in London.

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The Duchess of Cambridge was admitted to the hospital on Monday to treat hyperemesis gravidarum, an extreme form of morning sickness, due to her just-announced pregnancy.

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Father-to-be Prince William has been seen outside the hospital on numerous occasions this week, but this is the first photographed sighting of the aunt and uncle-to-be.

VIDEO: Prince William Visits Kate in the Hospital