NEW YORK (AP) — Chaka Khan and her sister have both entered a drug rehabilitation program to battle their addictions to prescription drugs, and Kahn says the death of her good friend Prince helped hasten her decision to get help. In a statement released to The Associated Press Sunday, the 63-year-old Grammy-winning singer said she has been battling an addiction to the same medication that led to Prince's death.Read more on NewsOK.com