Staying strong: Shannen Doherty puts her brave face on as she steps out with mom Rosa after chemo session

Published: 04:24 GMT, 23 September 2016 | Updated: 04:37 GMT, 23 September 2016

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She underwent grueling chemotherapy on Wednesday as she continues her battle with cancer.

And just 24 hours later, Shannen Doherty stoically stepped out in Malibu, California.

The 45-year-old Beverly Hills 90120 star may have looked somber, but obviously felt well enough to run some errands with her mum on Thursday.

Brave: Shannen Doherty stoically stepped out in Malibu on Thursday after receiving chemotherapy 24 hours earlier

Despite being weakened by her ongoing treatments for breast cancer, she took a stroll in the sunshine, covering her eyes with dark glasses.

Since she's lost her hair as a result of chemotherapy and radiation, the Charmed actress donned a blue and white baseball cap.

She kept comfortable in her baggies - grey sweat-pants and a white striped hoodie.

Sombre: Despite being weakened by her ongoing treatments for breast cancer, she took a stroll in the sunshine, covering her eyes with dark glasses

Her devoted mother, Rosa, accompanied the star on her outing, and has been by her side constantly during her illness.

She has been undergoing both chemotherapy and treatments in a hyperbaric chamber.

Shannen - who played Brenda Walsh in the 1990s hit high school series - was diagnosed with breast cancer in February 2015.

Support: Her devoted mother, Rosa, accompanied the star on her outing, and has been by her side constantly during her illness

Tests showed it had spread to her lymph nodes and she underwent a single mastectomy in May.

Brave Shannen headed for chemotherapy on Wednesday with her husband Kurt Iswarienko and mother in the vehicle, as she continued her valiant battle.

'Bright and early, in the car, listening to #thenational with my dream team @kurtiswarienko and @themamarosa Feeling blessed, loved and happy for this beautiful day,' posted the actress.

Treatment: Brave Shannen headed for chemotherapy on Wednesday with her husband Kurt Iswarienko and mother in the vehicle, as she continued her valiant battle

She is wearing a headscarf and sunglasses in the shot, and continued: 'Today is #chemoday and that means that I'm one step closer to being almost done.'

In addition to traditional treatments, she has also been open to more 'outside the box' approaches.

Last week, she posted a photo of herself resting inside a hyperbaric chamber and wearing an oxygen mask.

'My reconstructive surgeon, Dr Jay Orringer, wanted to have the best outcome possible. That meant a hyperbaric chamber along with many other outside of the box methods,' she explained. 'The result.... He saved my skin.'