Court documents show 35-year-old Christopher Chaney will plead guilty to nine felony counts and could face up to 60 years in prison.
Chaney admitted hacking into the accounts of more than 50 entertainers, including Mila Kunis, Christina Aguilera and Scarlett Johansson, whose nude pictures wound up on the web.
Chaney has apologized. There's no evidence he profited from the scheme.
