By Alexandra Whittaker
Updated Mar 24, 2018 @ 2:15 pm

After a mass shooting at Marjory Stoneman Douglas High School killed 17 people on Valentine's Day, there was a call for more gun control, and, on Saturday, those calls were actualized in the form of peaceful protest. Thousands participated in marches supporting gun control legislation in the March for Our Lives, lead by survivors of the Parkland shooting themselves.

The mission resonated with many celebrities, who turned out in demonstrations around the country to show support and call for reform. George and Amal Clooney were bundled up on the streets in Washington, D.C. to stand in solidarity with protestors, while Demi Lovato looked patriotic in a bright red coat and matching lipstick for her performance in the U.S. capital, singing "Skyscraper," which carried a meaningful message.

George and Amal Clooney
Credit: Kevin Mazur/Getty Images
Demi Lovato
Credit: Kevin Mazur/Getty Images

Meanwhile, Miley Cryus, her younger sister Noah, and Jimmy Fallon, posed together while holding up a MSD strong poster with a peace sign constructed from red and pink roses.

Jimmy Fallon, Miley Cyrus, and Noah Cyrus
Credit: Kevin Mazur/Getty Images

Other stars who showed up to march, included Paul McCartney, Glenn Close, Cher, Julianne Moore, Lin-Manuel Miranda, and Halsey. Additionally, Kim Kardashian and Kanye West made a superstar appearance.

Glenn Close and Cher
Credit: Kevin Mazur/Getty Images
Lin-Manuel Miranda and Halsey
Credit: Kevin Mazur/Getty Images
Paul McCartney
Credit: Spencer Platt/Getty Images
Julianne Moore
Credit: Kevin Mazur/Getty Images
Kim Kardashian and Kanye West
Credit: Paul Morigi/Getty Images

Even before the March for Our Lives, everyone from Jennifer Lopez to Taylor Swift made their support clear.

That support was not just talk, though. Oprah, George, and Amal Clooney donated $500,000 to the cause to help organizers put the march together. In the days before it took place, George wrote a public letter in The Guardian to Parkland students.

"Amal and I are 100% behind you and will be marching in DC on the 24th, but we both feel very strongly that this is your march. Your moment. Young people are taking it to the adults and that has been your most effective tool," he wrote.

"The fact that no adults will speak on the stage in DC is a powerful message to the world that if we can’t do something about gun violence then you will. The issue is going to be this, anyone you ask would feel proud to be interviewed by you but it’s so much more effective if it’s young people."

He concluded the letter, "Amal and I stand behind you, in support of you, in gratitude to you. You make me proud of my country again."