12/24/2013 AT 2:30 PM ET
Back in September, readers were moved by the story of 16-year-old Kennedy Hubbard and the work she does to help other children with Lymphatic Malformation, a potentially fatal condition which features fluid-filled cysts that distend her face and have threatened her airway ever since she was born.
But when hip-hop violinist Damien Escobar read Hubbard’s story – how the high school junior mentors other children with LM and raises money to help less fortunate sufferers afford treatment and for LM research – the two-time Emmy winner did more than click “Like.”
He picked up the phone and asked, “How can I help?”
What Escobar didn’t know at first was that Hubbard, of Moorestown, N.J., plays the violin herself. The pair teamed up at Hubbard’s Kennedy’s Cause fundraiser on Dec. 6 for a very emotional duet of “Mirrors,” by her favorite artist, Justin Timberlake.
“It’s tough for us to look in the mirror and accept who we have staring back. I went through it growing up,” Escobar tells PEOPLE. “Kennedy’s so courageous, how she deals with being unique, being different. I just wanted to help. And when she told me the song she wanted to do, I was like, This is perfect!”
Watch the video below to see what happens next.
Know a hero? Send suggestions to firstname.lastname@example.org. For more inspiring stories, read the latest issue of PEOPLE magazine