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"LA Reid, Britney Spears and Demi Lovato reacted with a mixture of confusion and bemusement at the arrival of Louis Walsh as a guest judge on X Factor USA. Walsh, who filled in for a sick Simon Cowell at the Kansas auditions, was not known by the other three US judges.      &amp;quot;I think this guy called Louis is going to be here,&amp;quot; comments Spears. A shocked Reid asks: &amp;quot;Who the hell is Louis?&amp;quot; In a VT about his career, Walsh brags about selling millions of records around the world and adds: &amp;quot;When Simon needs an opinion from someone he trusts, I&amp;#039;m the man he calls.&amp;quot;  &amp;gt; X Factor USA third auditions episode - recap Walsh attempts to get on side with his co-stars by joking about becoming a permanent replacement for Cowell.  &amp;quot;Britney, we might not want [Simon] back!&amp;quot; he shouts. X Factor USA continues tonight (September 20) on Fox. It will air in the UK on ITV2 later this month. X Factor USA latest pictures:  "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.digitalspy.com/tv/the-x-factor-us/news/a407202/louis-walsh-arrives-on-x-factor-usa-who-the-hell-is-louis-video/>