British retail billionaire Philip Green has hired chart-topping R&B group Destiny's Child to perform at his son's bar mitzvah. The stars are set to entertain guests at the three-day event on the French Riviera estimated to have cost the Bhs and Top Shop boss £4m ($7.4m). Singer Justin Timberlake could also be performing, The Times reports. Mr Green is said to have chartered a plane to fly about 200 of his family's friends to the bash this weekend. The guests are being put up at the exclusive Hotel du Cap in Cannes, with the actual bar mitzvah itself expected to...