Organizers said more than 116,000 people had pledged to participate in marches or other actions in Washington D.C. and other cities on Saturday.
The Los Angeles-based pop artist and advocate says her new single, "If I Ruled The World," represents her vision of the world she wants.
Museum officials removed the photo from the display and said they would replace it with an unaltered version "as soon as possible."
An official told The Washington Post it was only a "promotional display." Critics said that didn't make the changes OK.
The House speaker has cautioned against moving forward without an “ironclad” case, but she's facing increased pressure to begin the process.
The actress' new book, "Era of Ignition," explores her journey from professional object to activist subject -- and asks us all to do better.
"We just captured the House, and now we’re going to show what we’re going to do with it," the star congresswoman told the crowd.
Women are coming out in force in New York, Washington, D.C., and around the globe.
“You have to imagine, everyone’s wearing these hats, but I’m the one who created it, and it’s like I have this delicious secret.”
The movement’s leadership has been roiled by claims of anti-Semitism but hopes women will turn up across the country for the third year.