Book 'em Danno – for guest roles.

Real-life engaged couple Vanessa Minnillo and Nick Lachey have been cast on the CBS drama Hawaii Five-0, PEOPLE has learned.

According to a source, in an episode airing February, Minnillo will play a woman named Susan, engaged to Lachey's character named Tyler. Minnillo will work as a deckhand on a cruise boat that's taken hostage by pirates.

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