But people were quick to notice that the actress and UN ambassador was missing a vital punctuation mark from the inking – an apostrophe.
Instead of reading “Time’s Up”, Ms Watson’s tattoo says “Times Up”.
Some have questioned whether the tattoo is real, or simply a temporary piece to make a statement.
Others backed her decision to get rid of the apostrophe, with one tweeter suggesting it would look “weird just floating there”.
The apostrophe is also missing from the movement’s hashtag on social media, as they do not yet support punctuation marks.
Ms Watson has been a vocal and leading supporter of the Time’s Up movement, which seeks to end sexual harassment in Hollywood.
In a post on Instagram about the movement last month, Ms Watson wrote: “All of us are responsible for creating change, whatever industry you work in. We’re asking everyone to help create a world we can be proud of – one that is safe, just and equal.
“Please join us and donate to the new Justice and Equality Fund, which will support frontline organisations that are working to end a culture where harassment and abuse are commonplace.
“Together we can spread our message, support the strong people of all genders who are taking such personal risks, and make sure that this is one of those watershed moments in history where things never go back to the way they were before.”
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Ms Watson has not publicly commented on the new inking yet, though thankfully, the missing apostrophe will be an easy fix.
In a similarly bold grammatical move, the book store Waterstones dropped its apostrophe in 2012, prompting outrage as some people asked “is nothing sacred?”.