Who Plays Scott Caan's New Nemesis on Hawaii Five-0?

We've got the scoop on which pretty boy from a canceled-too-soon drama is joining the cast of Hawaii Five-0 as a rival for Scott Caan's Danny!� Plus, could that new Vampire...

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Gwen Stefani Harold Dow Olive Uniacke Tila Tequila Steven Slater Nick Lachey