Shannen Doherty goes on weekly "date nights" with Chelsea Handler

Shannen shared a picture of herself and Chelsea on Instagram and wrote: "And then there is this lady.... @chelseahandler We met many many years ago. Have run into each other and always exchanged numbers, talked of plans etc.

"Chelsea reached out and has since, made a point to have date nights with me on a weekly basis. Yeah she's funny but also wicked smart with a huge heart. This one just wants to make a difference.

"Sometimes the right people come into your life at the right time. #girlpower #fightlikeagirl (sic)"

Shannen also thanked another of her friends, Sarah Michelle Gellar, for her support after the 'Buff the Vampire Slayer' actress shared a picture of the two stars with the former 'Beverly Hills, 90210' star's doctor and urged her followers to ensure they undergo regular screening for breast cancer.

Shannen wrote: "It's so important when battling a disease like cancer to have friends like @sarahmgellar thank you for always having my back and educating all about this disease. Love you. (sic)"

In an emotional Instagram post, the actress - who is married to Kurt Iswarienko - also admitted she sometimes has moments of feeling like she isn't going to "make it" through her battle against the disease.

Alongside a heartbreaking photograph of Shannen lying on her side on a hospital bed after a round of chemotherapy, she wrote: "#fbf to a very short bit ago. Day after #chemoday isn't always so great. Sometimes one isn't able to dance, or eat or even to think about the next day. Sometimes it just feels like you aren't going to make it. That passes. Sometimes the next day or 2 days later or 6 but it passes and movement is possible. Hope is possible. Possibility is possible. To my cancer family and everyone suffering.... stay courageous. Stay strong. Stay positive. #wegotthis. #fightlikeagirl (sic)"