Today, hundreds of thousands of people across the U.S. are participating in the March for Our Lives to demand gun control. The event's website explains its mission statement: "March for Our Lives is created by, inspired by, and led by students across the country who will no longer risk their lives waiting for someone else to take action to stop the epidemic of mass school shootings that has become all too familiar."
Celebrity activists are among the marchers, including Yara Shahidi, who posted an inspiring video message on her Instagram today. "Today I stand in reverence of the students who’ve experienced such personal tragedy and have used their voices to unite. To take action," Shahidi wrote. "Today we join them and March for Our Lives. Today we reclaim our right to safety." Read on to see more celebrity posts from the march.