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.

Sobiech was featured as one of PEOPLE’s Heroes Among Us earlier this year. His music video for “Clouds” is up to 2.6 million views and counting. Last May, doctors gave the teenager a grim prognosis: he had up to a year to live.

“We’re approaching that year mark,” Zach told PEOPLE in March. “It’s scary to think about, but the key is to not feel bad for yourself.”

The song “was for me and my family,” he said. “I needed to get that emotion out and they wanted something they could remember me by.”

He’s also been using his remaining time to help others, teaming with the Children’s Cancer Research Fund and hopes to raise awareness for kids suffering from his rare form of cancer.

“Our goal,” he said, “is to give other kids with osteosarcoma a chance.”

Go behind the scenes of Rachel Bilson’s May 2013 Cosmo cover shoot, plus check out captures into the gallery.

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  Screen Captures > Photoshoots BTS Screen Captures > Cosmo USA – May 2013

On 15 January Rachel Bilson have attend The Talk show, you can watch the video below. Also check out 302 HD captures from it.

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  Screen Captures > Talk Shows > The Talk – 15 January 2013

Happy Halloween to one and all! Although celebrations on the East Coast have been dampened by Hurricane Sandy, the rest of the country is getting ready for trick-or-treating, costume parties or just handing out candy.

As part of our celebration, we asked celebrities to treat us to memories of their favorite costumes and Halloween memories.

“I was a hot dog last year,” “Hart of Dixie” star Rachel Bilson recalled. “I thought, ‘I’m so clever, I’m going to be a hot dog,’ and I showed up and another girl was wearing the same costume. Except she was a slutty hot dog. I don’t know what she did, but it was a miniskirt hot-dog situation that was so wrong on so many levels. I thought, ‘You are going to get so much ketchup squirted on you,’ ” she joked.

Find out which cast member is dressing up as a sexy Hollywood legend! Plus, is Rachel Bilson Team George or Team Wade?

Guest Editor Rachel Bilson stops by the new Piperlime boutique in SoHo to share her fall fashion picks.