William and Kate's new portraits echo shots of Charles and Diana before they got married

Credit: Copyright 2010 Mario Testino;AP

Call it royal double-take: two blushing brides, two grinning grooms and one stunning sapphire engagement ring.

With the new release of two official portraits of Prince William and his fiancée Kate Middleton, it’s easy to draw comparisons with pictures William’s parents, Charles and Diana, who became engaged in 1981.

An invitation photo shows a smiling Lady Diana Spencer, then just 19 years old, her arms wrapped around Prince Charles, then 33, and her diamond-and-sapphire engagement ring on prominent display. They show the same sort of embrace as this generation’s royal couple, William and Kate.

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The new photo, taken by noted fashion and celebrity photographer Mario Testino, along with a more formal portrait, features a relaxed-looking William, 28, and Kate, 28, in a cozy embrace – with the very same sparkling sapphire engagement ring again in the spotlight.