It's official, they are engaged

Britain's Prince William will marry his longtime girlfriend, Kate Middleton, next spring or summer in London, the royal family announced Tuesday. A spokesman for Prince Charles said Prince William gave Kate Middleton the engagement ring that belonged to his late mother, Princess Diana.

The ring is an oval sapphire surrounded by diamonds.

The engagement announcement ends years of rumored splits, reconciliations and will-they, won’t-they speculation. It will be the biggest royal wedding since Prince Charles married Lady Diana Spencer almost 30 years ago.

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