Through the halls of the hospital, in their rooms and next to the nurses' station, children in the Johns Hopkins Pediatric Oncology unit are sending a message to the world.
"It was different from what you do normally," said Emily Yang, an 11-year-old patient.
"Having a little bit more fun than taking medicine and stuff," said Gino Defilippo, a 17-year-old patient.
"They wanted to capture things they do on the unit that's fun. You know, not focus on being sick or anything like that," said Carlos Harris, producer.
They created a music video to One Direction's song "What Makes You Beautiful" and posted it on YouTube.
In just a week it went viral and now has nearly 140,000 views.
"I thought it would get less hits, but then I was like 'Oh my goodness!' when I saw," said Yang.
One Direction band member Liam Payne even tweeted the video out to his six-million followers.
"I hope they liked it and I'm famous now," said 9-year-old Gregory Meecham.
Karly Gerow's parents say seeing their daughter in the video brought them to tears.
"We love her smile and we love seeing her have a good time and it's just nice to be able to share that, too," said her father, Mike Gerow.
"It's important to see it's not all tragedy here. The kids do and are able to have a lot of fun," said her mother, Shannon.
And while the children say they'd like to make another music video, they're soaking up their stardom for now.