At the march in Washington, Alicia Keys sang "Girl on Fire" and California Sen. Kamala Harris as well as Rep. Maxine Waters addressed the massive crowd. Madonna, Julia Roberts, Cher and Emma Watson were also some of the celebrities in attendance.
Actress Scarlett Johansson spoke during the march, talking about how Planned Parenthood helped her. She also mentioned how all of her friends had stories about Planned Parenthood, including one who received help from the organization to get the proper cancer treatment.
"For the more than 2.5 million patients a year that rely on Planned Parenthood services for cancer and STD screenings, birth control, safe abortion and pregnancy planning, these are uncertain and anxious times," she said.
Toward the end of her speech, she called out President Donald Trump directly, who campaigned to defund Planned Parenthood.
"President Trump, I did not vote for you," she said.
She asked that the president support her and all women instead of making decisions and policies that could "drastically affect their lives."
Other celebrities, such as Katy Perry, Mandy Moore, Laura Prepon, Amy Schumer, Jenny Slate, Debra Messing, Amber Tamblyn, Ellen Page and Zendaya, participated in marches in Boston, Los Angeles, Miami and Park City, Utah, among others.
Many male celebrities even attended or lent their support to their female friends on social media. Nick Jonas, Patton Oswalt, Kevin Bacon and the band Pearl Jam showed some love on Twitter.
Actor Joseph Gordon Levitt showed his support by attending the Women's March in L.A., while Nick Offerman and Kevin Bacon attended the Park City event.
Hundreds of thousands of people marched in solidarity and for the protection of women's rights at the march in Washington and sister marches across the country.