<p><span></span>They say never mix business with pleasure, but <strong>Cheryl Burke</strong> and <strong>Mark Ballas</strong> have apparently never heard that advice before.</p>
An eyewitness tells Life & Style's Scene Queens that the Dancing With the Stars co-stars got hot and heavy at fellow cast member Derek Hough's Doctrine Denim launch party at Boudoir in West Hollywood Oct. 12. "One minute Cheryl was sitting in a corner in deep conversation with dancing partner Rick Fox; then the next minute she was totally making out with Mark!" the spy tells the Scene Queens.
This isn't the first time that Mark and Cheryl have been linked to fellow dancers. Cheryl was rumored to have dated her DWTS partner, football star Chad Ochocinco this summer. Meanwhile, reports of a romance between Mark and DWTS pro Chelsie Hightower were rampant last season.
Could booze be to blame for this hook-up? "There was bottle service, and Cheryl and Mark both had numerous vodka cocktails," the spy adds. "And Derek even extended the hours of the event so everyone could stay and party longer."
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