Los Angeles: American singer Yvette Marie Stevens, better known by the stage name Chaka Khan, has reportedly entered a drug rehabilitation program to battle her addiction to prescription drugs. Representatives for Khan said in a statement that the 63-year-old singer had entered rehab and aftercare program for an addiction to prescription pain medication, reports people.com. "Representatives for Chaka Khan announced today that ten-time Grammy Award-winning recording artist Chaka Khan has entered an addiction rehabilitation and aftercare program which will cause her to postpone all dates scheduled for the month of July," the statement read. The statement also said that Khan has been urged by doctors to resume recording music mid-July. "Chaka has struggled with a dependence on prescription pain medications and has voluntarily entered the program to get healthy and stay that way. As part of the ongoing outpatient treatment the doctors have urged her to resume recording mid-July and commence all performances beginning August 1 and onward," it added.