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"Denise Richards has landed a guest starring role on 90210. Richards is set to appear in the show&amp;#039;s 100th episode a Gwen, a &amp;quot;West Beverly High School alum turned wealthy socialite&amp;quot;, reports Entertainment Weekly.   Gwen is said to run &amp;quot;a very exclusive women&amp;#039;s club filled with powerful women&amp;quot;, which attracts the attention of Naomi Clark (series regular AnnaLynne McCord).  The 100th episode - airing on November 6 - sees Naomi wanting to become a member of Gwen&amp;#039;s club but then realizes that it&amp;#039;s &amp;quot;a grown up version of a Mean Girls clique from high school&amp;quot;. Richards previously appeared on her ex-husband&amp;#039;s Charlie Sheen&amp;#039;s new show Anger Management. &amp;quot;It was more awkward for everyone on set watching,&amp;quot; Richards said about her time on Anger Management, adding that everyone was staring at the pair. 90201 will return on October 8 on CW. Watch a video promo of 90210&amp;#039;s fourth season below:      "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.digitalspy.com/tv/90210/news/a401830/denise-richards-to-guest-star-in-100th-episode-of-cws-90210/>