Chaka Khan has entered drug rehab with her sister to help end their addiction to prescription drugs. Khan, 63, says Prince’s recent death was the impetus for her seeking help. "The tragic death of Prince has had us both rethinking and reevaluating our lives and priorities,” she wrote in a statement. “We knew it was time to take action to save our lives. My sister and I would like to thank everyone for their support, love and prayers." Khan said she is addicted to the same medication as Prince. She also said she will be missing concerts this summer as a result.