Sometimes celebs just keep on surprising you and this was one of them. Melanie Griffith has checked into a drug rehab for an addiction to prescription medication….again! This will be Griffith’s 3rd try at rehab and you know what they say three times is the charm! Her reps are saying that she is in there to “reinforce her commitment to stay healthy”. We think what they want to say was “she fell off the wagon again.”