EXCLUSIVE: Jason Priestley Speaks Out on Shannen Doherty's 'Incredibly Brave' Cancer Battle: 'She's Always Bee

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Shannen Doherty has been battling breast cancer since she was diagnosed last year, and her former Beverly Hills, 90210 co-star, Jason Priestly, is showing his support.

Priestly spoke with ET at the Raising The Bar to End Parkinson’s fundraiser benefiting the Michael J. Fox Foundation at Laurel Point in Studio City, California on Wednesday, and he had nothing but love and well-wishes for Doherty.

WATCH: Shannen Doherty Opens Up About Cancer Battle and Her Career

The 45-year-old actress recently shaved her head in anticipation of her fight against her aggressive ailment, and documented the emotional process on Instagram -- a decision that Priestly praised.

WATCH: Shannen Doherty Chronicles Shaving Her Head Amid Breast Cancer Battle

"What she did the other day, shaving her head and posting the pictures and everything, that was incredibly brave," the Private Eyes star shared.

"Shannen's a strong kid and a tough fighter and I know that she's gonna come through this fight and she's gonna be OK," he added.

The 46-year-old actor also praised the way Doherty has used her illness and her public platform to "shine a light and help other people."

WATCH: Shannen Doherty Makes First Red Carpet Appearance Since Breast Cancer Announcement

Actress Tiffani Thiessen, who replaced Doherty on Beverly Hills, 90210 when she left after the fourth season, was also in attendance at the fundraiser. Thiessen told ET, "I wish her all the best, of course."

For more on the former Charmed star's struggle against cancer, and her recent decision to shave off her brunette locks, watch the video below.