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Sarah Michelle Gellar cheers 'brave friend' Shannen Doherty as star battles cancer

by Ree Hines / / Source: TODAY

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Shannen Doherty is battling breast cancer, but she isn't fighting alone.

The actress has been surrounded by loved ones every step of the way, and now one of them — longtime pal Sarah Michelle Gellar — is publicly celebrating Doherty's courage and grace.

Gellar shared a photo of the two of them with her followers on Instagram and added a moving message.

"My #mondaymuse (and really every day #muse) is my brave friend @theshando," she wrote. "I've always said she is one of the most loyal friends I've ever known, and now while she is facing the toughest journey of her life, she is sharing it with friends she has never met in the hopes of helping other people who are going through the same struggle. That's a true friend."

 Sarah Michelle Gellar And Shannen Doherty. Diane Freed / Getty Images

RELATED: Shannen Doherty shaves her head amid breast cancer battle — see the moving pics

Doherty hasn't held back when it comes to opening up about details of the struggles, triumphs and realities of cancer since her 2015 diagnosis.

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In July, she shaved her head and documented each step of the emotionally painful process.

Earlier this month, the former "Beverly Hills 90210" and "Charmed" star offered details about the progression of the disease, including the news that it had spread.

And she continues to share her ongoing experience via social media and appreciates others who do the same.

"Each persons cancer journey is different," she recently wrote. "For me, chemo has been terrible and believe me, we have tried almost everything. So days like this have become a bit of the norm. I'm learning that it's ok to fall into bed and give in to the exhaustion or nausea or aches. I've learned a lot of that thru all the beautiful people who have shared their personal stories with me right here on Instagram."

RELATED: Shannen Doherty's breast cancer has spread: 'The unknown is the scariest part'

And while friends and family like Gellar celebrate her, Doherty's also celebrating them — and herself, too.

Follow Ree Hines on Twitter.

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