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"&lt;img alt=\"0828_tmz_justin_bieber_xfactor\" src=\"http://ll-media.tmz.com/2012/08/28/0828-tmz-justin-bieber-xfactor-3.jpg\" /&gt;&lt;strong&gt;Simon Cowell&lt;/strong&gt; has a new enemy ... &lt;strong&gt;Justin Bieber&lt;/strong&gt; -- 'cause the pop star has teamed up with rival \"&lt;strong&gt;X Factor&lt;/strong&gt;\" judge &lt;strong&gt;L.A. Reid&lt;/strong&gt; to become a celebrity mentor on the upcoming season of the show. &lt;br /&gt;&lt;br /&gt;TMZ has learned ... Bieber agreed to be one of 4 celebrity mentors assigned to one of the 4 judges ... Simon, L.A., &lt;strong&gt;Britney Spears&lt;/strong&gt; and &lt;strong&gt;Demi Lovato&lt;/strong&gt;. &lt;br /&gt;&lt;br /&gt;Bieber agreed to help out L.A.'s squad ... and yesterday, Justin went to a home in the Hollywood Hills to dish out some quality advice to the contestants. &lt;br /&gt;&lt;br /&gt;It's unclear which celebrities have been tapped to help out the other judges -- but good luck doing better than Bieber."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.tmz.com/2012/08/28/justin-bieber-x-factor-simon-cowell/>