Fresh off his highly successful Coachella performances, Justin Bieber performed another show -- but this time the audience was some of the most powerful people in Hollywood and tech. JB played a shortened set this week at Jeffrey Katzenberg 's WNDR conference -- his annual, super exclusive bash for Fortune 100 CEOs, tech entrepreneurs, and celebs at the Rosewood Miramar in Montecito ... according to Puck 's Dylan Byers No word on which songs Justin performed -- there are only a few snaps from