You might remember a few months ago the story I told you about Zach Sobiech, a high school senior with terminal cancer who recorded a song by the title of "Clouds" that he called his goodbye song for his family and friends.

Well, Zach's video of Clouds has had over 2 million views on YouTube and chances are good you've seen it. We know for sure that many celebrities have checked it out and that Zach's story has touched their hearts because several of them teamed up to make a cameo in a video featuring Zach's song to help raise awareness and research funds in Zach's honor.

Watch the video to hear Zach's heart gripping goodbye song and see the celebs who are standing firmly behind him (those celebs are: Rainn Wilson, Brian Cranston, Sarah Silverman, Ashley Tisdale, Colbie Caillat, Chris Pratt, Anna Faris, Jason Mraz, Sara Bareilles, Andy Grammer, Jenna Fischer, Angela Kinsey, Jenna Elfman, Jack McBrayer, Lumineers, Jason Derulo, The Mowgli's, Rachel Bilson, Kina Grannis, Passenger, Creed Bratton, Tyler Hilton, Mark Duplass, Josh Gad, Jason Wade, Paul McDonald, Ed Helms, Phillip Phillips, Justin Young, and Alyssa Shouse.)

If you want to learn more about Zach and his story, check this out- but grab tissues first: