05:27 AM EDT 03/19/2015
Originally posted 05/09/2013 01:30PM
This could easily be the most moving celebrity shout-out of all time.
Zach Sobiech, 17, inspired millions with his cancer fight and the farewell song he penned, "Clouds."
Now, a slew of celebrities are showing their support for the brave teenager (he's been diagnosed with osteosarcoma) with a tribute video set to his song, in an effort to raise awareness and funds to help find a cure for childhood cancer.
Among the stars featured in the new video, which airs on Rainn Wilson's SoulPancake YouTube channel: Ashley Tisdale, Colbie Caillat, Anna Faris, Jason Mraz, Sara Bareilles, Jenna Fischer, The Lumineers, Rachel Bilson, Ed Helms, Phillip Phillips and more.
Top 5 Most Voted Stories
Flip or Flop Host Tarek El Moussa Battling Thyroid Cancer
Will Smith Shares the Secrets to His Successful Marriage to Jada Pinkett Smith
Khloé Kardashian Quits PETA after Flour Bombing of Kim Kardashian
Rock Hudson's 'True Love' Speaks: How We Kept Our Gay Life Secret
Jury Selection Opens in Trial for Florida Man Accused of Murdering His Wife and Posting a Photo of Her Corpse Online
Top 10 News Categories
The most buzzed about stars this minute!
Treat Yourself! 4 Preview Issues
More On PEOPLE.com
Got a News Tip?
Send it to our People.com editors!