ON MATTERS of style, Chris O’Dowd is more guy-next-door than Mr. Hollywood. Though based in Los Angeles, the Irish actor, 43, only shops once every two years and lacks a skin-care regimen. “Whatever is there.” Don’t expect him to jump on hot fitness trends. His big break came in 2006 via quirky British comedy “The IT Crowd” (now on Netflix ). Since, he’s brought offbeat charm to such movies as “Bridesmaids,” “Molly’s Game” and “St.

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