DOWNEY TO WRITE AUTOBIOGRAPHY

WRITING IT DOWN-EY:

Cocaine poster boy Robert Downey Jr. -- who calls his drug of choice "sniffy-sniffy" (isn't that CUTE?) -- tells pals he's writing a let-it-all-hang-out autobio while confined to drug rehab! He'll hire a ghostwriter to spiff it up! (Bob, my O.J. book was New York Times Numero Uno, so . . . call me, babe!)