The man who hacked Scarlett Johansson, Mila Kunis, and others -- leaking several nude photos onto the Internet -- has just been sentenced to 10 years in prison.

36-year-old Christopher Chaney pled guilty to 9 felony counts back in March -- including identity theft, wiretapping, and unauthorized access and damage to a protected computer -- after hacking into the celebrity email accounts ... and dozens of others.

During the sentencing, Chaney -- who was arrested in October 2011 -- was also ordered to pay $76,000 in restitution to ScarJo, Christina Aguilera, and "Still Standing" actress Renee Olstead.

But 10 years is a walk in the park -- Chaney was originally accused of hacking into the email accounts of 50 victims ... including dozens of celebs ... and faced 121 YEARS if convicted on all counts.