Matt Webb Mitovich brings us the scoop on Hawaii Five-O: With Alex O’Loughlin starring in the new Hawaii Five-0˜ (premiering Sept. 20, CBS), I would love to see this hottie in an on-screen romance. Any scoop on that? “Amy Will there be onscreen romance for Alex’s Steve McGarrett? Goodness gracious, yes! a (female) source assures The…