If you believe Twitter, or if you believe that Hugh Hefner, 85, is actually tweeting his own updates, the Playboy magnate has a new &ldquo;best girl,&rdquo; a week after fiancee Crystal Harris dumped him. The octogenarian tweeted this week that Anna Sophia Berglund, January&rsquo;s Playmate of the Month, is his newest 25-year-old companion. &ldquo;With Crystal [...]