Celebrities across the nation came out in support of the March for Our Lives today, joining protestors in the fight for stricter American gun laws. In cities such as New York City, Los Angeles, and Washington (just a few of many), stars participated in the movement by either performing onstage or taking to the streets with homemade signs. Attendees included George and Amal Clooney, Kim Kardashian West, Miley Cyrus, Lady Gaga, Paul McCartney, Common, Ariana Grande, Demi Lovato, Sheryl Crow, Jennifer Hudson, Cher, Will Smith, Justin Timberlake, Amy Poehler, and many more.

In New York City, Paul McCartney marched in remembrance of his late friend and Beatles bandmate John Lennon, who was shot outside of his apartment on December 8, 1980. “One of my best friends was killed in gun violence right around here,” McCartney said during the march. Also in attendance in the city were Lady Gaga and Cynthia Nixon, who announced she is running for governor of New York last week. “Incredibly moved at how many people came out today to stake a stand for our kids and demand action against gun violence,” Nixon tweeted.

Meanwhile, George and Amal Clooney, who donated $500,000 to the survivors of the Parkland, Florida, shooting, made an appearance at the march in Washington, D.C. Also present were Kim Kardashian West and Kanye West, Julianne Moore, and singer Demi Lovato, who performed her single “Skyscraper.”

Stars also took to social media to show their support. Amy Schumer, who has been a vocal advocate for stricter gun laws, took to Instagram to express her support for the march, saying, “We need to digitize gun-sales records, mandate universal background checks, close gun-show loopholes and straw-man purchases, ban high-capacity magazines, and push for a comprehensive assault weapons ban with an extensive buyback system.” Amy Poehler also applauded the students and youth who helped ignite the movement: “We stand with you, young people. I applaud your bravery and your incredible poise, and the fire that you have started will not go out. It will only get stronger, and we will help fan the flames.”

Below, see more celebrities who showed up for the march.