Shannen Doherty Has 'Girls Night' Out Before Next Round of Chemo and After Settling Cancer Lawsuit

This video is unavailable because we were unable to load a message from our sponsors.

If you are using ad-blocking software, please disable it and reload the page.

Shannen Doherty was in the mood to celebrate on Monday night.

An eyewitness tells ET that the 45-year-old actress -- who revealed her battle with breast cancer earlier this year -- appeared to be in "good spirits" and "laughing" while dining with a friend at Nobu Malibu. "She even said she was 'very happy,'" the eyewitness said. "It looked like she was there celebrating something."

WATCH: Shannen Doherty Shares Photo of Her Completely Shaved Head -- It Was an 'Impossibly Tough Day'

Doherty shared on Instagram that she was indeed celebrating with her pal, Ann Marie Kortright. "Love girls night with @annemkortright helping me celebrate feeling good enough to eat before Wednesday's chemo. #bff #fightlikeagirl #cancersucks #warrior," she wrote.

Earlier in the day, ET obtained documents confirming that the Beverly Hills, 90210 star had settled her legal battle with her former management firm. Doherty sued Tanner Mainstain, claiming Mainstain allowed her insurance coverage to lapse, which she says kept her from a regular checkup and thus caused her cancer to go undiagnosed. The actress landed a settlement in the $15 million suit, but the amount is undisclosed.

EXCLUSIVE: Shannen Doherty Reveals How Beverly Hills, 90210 Foreshadowed Her Breast Cancer Battle

In an emotional interview with ET last month, Doherty revealed her struggle to stay strong amid her breast cancer battle. "It's hard. I started thinking that I wasn't going to live... I don't look past today," she said through tears. "I want to believe that if I fight, I'm gonna be OK."