The hashtag is encouraging students to join a March 24 gathering in Washington to demand gun control legislation.

The survivors of last week's deadly school shooting at Marjory Stoneman Douglas High School in Parkland, Florida, are determined to honor the lives of the 17 victims in the massacre by doing something. Specifically, they are calling for fellow students and their families to join them for a mass march on Washington, DC, on March 24 to demand action on gun control called March For Our Lives.

“People keep asking us, 'What about the Stoneman Douglas shooting is going to be different, because this has happened before and change hasn't come?'” Cameron Kasky, an 11th-grader at the school told ABC News. “This is it... People are saying that it’s not time to talk about gun control. And we can respect that. Here’s a time. March 24th in every single city. We are going to be marching together as students begging for our lives.”

And while the students are adamant that the movement is about putting common sense gun laws into place, not politics, Kasky made one thing very clear: "you're either with us or against us."

As it turns out, a number of high-profile musicians and actors are most assuredly with the March for Our Lives. Among the celebs tweeting their support for the action are Justin Bieber, Paramore's Hayley Williams, Fifth Harmony's Lauren Jauregui, St. Vincent and Amy Schumer.

Check out their tweets below:

never want to hear another adult talk condescendingly about millenials/young ppl ever again. face the hopeful, intelligent, unwavering presence of your future leaders of America. #MarchForOurLives #March24th https://t.co/rB9n3rzqXd — hayley from Paramore (@yelyahwilliams) February 18, 2018

Thank GOD they put a brilliant young woman at the frontline of this conversation. GOD BLESS this woman & her brain and sense of justice. I? commend you using your voice and being so REALL about wtf is really going on. Sending love to you and all the families #EmmaGonzales https://t.co/ZhyWbYeqUg — Lauren Jauregui (@LaurenJauregui) February 18, 2018

These Florida teenagers speaking truth to power are giving me all the hope right now. — St. Vincent (@st_vincent) February 18, 2018

I know everyone has retweeted already but ... https://t.co/0IzlS1tM9k — Idina Menzel (@idinamenzel) February 18, 2018

Cameron good talking to you last night. All of your bravery is amazing. I stand with you guys. #march24 #marchforourlives https://t.co/oKG8MmhzaI — Justin Bieber (@justinbieber) February 18, 2018