Three message threads - known as subreddits - were banned after users took to the the forums to share the leaked photos.
An error message now appears on the threads saying: "this subreddit has been banned".
Reddit rejected claims the decision to shut down the pages was due to pressure, saying the message threads had violated community rules.
In a statement posted on its blog, Reddit said it "deplore[d] the theft of these images and we do not condone their widespread distribution."
The statement acknowledged that Reddit has been used as "one of the primary centres of distribution" of the "unlawfully obtained images".
"In accordance with our legal obligations, we expeditiously removed content hosted on our servers as soon as we received DMCA requests from the lawful owners of that content, and in cases where the images were not hosted on our servers, we promptly directed them to the hosts of those services," the statement read.
But the company said the decision did not reflect a broader change in its policy on banning content.
"Having said that, we are unlikely to make changes to our existing site content policies in response to this specific event."
The leaked photos of celebrities including Jennifer Lawrence, Avril Lavigne and Rihanna, were hacked from a cloud storage system.
Part of the upgraded features will include sending users alerts during password changes or when someone logs on from a new gadget.
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