He had stolen the usernames and passwords of more than 600 people.
Collins tricked his victims - including actresses Jennifer Lawrence, Kate Upton, Scarlett Johansson, and Kirsten Dunst - by sending emails appearing be from Google or Apple.
Collins was charged with accessing the photos between 2012 and 2014, in a case known as "celebgate". But was not charged with releasing them.
A statement by prosecutors said: "Investigators have not uncovered any evidence linking Collins to the actual leaks or that Collins shared or uploaded the information he obtained."
Collins accessed at least 50 iCloud accounts and 72 Gmail accounts.
Court filings said he had used fraudulent email addresses designed to look like security accounts from service providers, including [email protected], [email protected] and [email protected].
Collins was originally charged in Los Angeles, but sentenced in Pennsylvania, his home state.
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