Shannen Doherty knows exactly what Michael Bublé is going through.

>> Singer Michael Buble announces his 3-year-old has cancer

The singer revealed last week that his 3-year-old son, Noah, has been diagnosed with cancer. On Friday, he shared the news of the diagnosis and stated that he will be taking time off to focus on his family.

“We are devastated about the recent cancer diagnosis of our oldest son, Noah, who is currently undergoing treatment in the U.S.,” he wrote to fans on Facebook. “We have always been very vocal about the importance of family and the love we have for our children.”

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Doherty, who is battling a breast cancer diagnosis, attended the American Cancer Society’s Inaugural Giants of Science Gala in Beverly Hills on Saturday and offered her support to Bublé and his family.

"I can't even begin to touch that one, to be honest, because it's a 3-year-old," she said to Entertainment Tonight. "I would imagine your child having cancer is devastating as a parent."

>> Shannen Doherty thanks husband for standing by her as she battles cancer

She added: "Just trust in your doctors. Make sure you have amazing doctors, a great team and know that organizations like the American Cancer Society, Stand Up to Cancer, they are doing so much good for cancer. And [there is] so much research that we have much better chances now. Stay positive.

“That positivity, that outlook on life that you can get through something, it actually does get you through."

Before hitting the event, Doherty shared a sweet image of her support system.

>> Click here to see the photo