{{WP|url|text (optional)}}
Or, as the "Wikipedia-short link is actually placed in an article:
{{Wikipedia-short link|text (optional)}}

Where "url" is the name of the article on Wikipedia (the part of the URL right after /wiki/), and "text" is what you wish to be the link text (this is to remove unnecessary things such as "(actor)" which may be a part of the Wikipedia article's name).

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