Keep on fighting!
On Tuesday, she shared a photo of herself on a girls' night out with friend Anne Marie Kortright at Nobu in Malibu.
The 45-year-old wrote:
"Love girls night with @annemkortright helping me celebrate feeling good enough to eat before Wednesday's chemo. #bff #fightlikeagirl#cancersucks #warrior"
Heck yeah, she's a warrior!
We know she's gonna beat this thing, and we're totally in her corner.
We also hope her chemo treatment goes well today.
You're in our thoughts, Shannen!
[Image via Instagram.]