Emma Watson's HeForShe launching speech at the UN headquarters in New York last weekend didn't just clarify the meaning of 'feminism.'

She spoke in front of world leaders and essentially the entire world to call on "as many men and boys" to help promote gender equality and eliminate violence against women and girls.

On Monday, she launched the campaign on Twitter, calling all males to publicly support HeForShe, along with a link of its official website.

She tweeted, "Wonderful men out there. I'm launching a campaign - #heforshe. Support the women in ur lives and sign up here now!"

She also asked them to post a photo of themselves signing up for the campaign.

Russell Crowe, Tom Hiddleston, Neil Gaiman, Logan Lerman, Harry Styles, Simon Pegg, Chris Colfer, Luke Newberry, and Matthew Lewis are just some of the men who responded.

Browse through the gallery to see who responded to Emma Watson's HeForShe campaign!