The beloved TV star died in March 2019 at the age of 52, following a stroke.
Several stars from the beloved teen drama took to social media on Sunday to celebrate Perry's life and legacy with some heartfelt tributes.
"All brothers from different mothers. Happy birthday LP, RIP," Ziering captioned the pic.
Green also posted a flashback pic showing himself and Perry in their 20s, on a beach, enjoying the sun and wearing t-shirts emblazoned with the show's name.
Green wrote alongside the photo simply, "Happy Birthday brother!! Love You ❤️"
Meanwhile, Jennie Garth shared a more contemporary photo, snapped in black-and-white, showing her and Perry posing cheek-to-cheek for a sweet selfie.
Garth captioned her tribute, "Forever in my heart."
Tori Spelling also reflected on the bittersweet occasion, posting a photo of herself and her 3-year-old son, Beau.
"Lazy Sunday with family... some downtime today gives me a pause for reflection. Grateful to my family and extended family. Loving on them hard right now," she wrote. "And, doesn’t feel right not to mention that today is our brother Luke’s bday."
"Thinking about him and missing him. But, that’s everyday," she continued. "So grateful he got to meet my littlest Beau and snuggle him when he was a babe."
Perry died on March 4, 2019, after suffering a massive stroke. He was 52. The loss was felt across the country as many of his friends, family, fans and former co-stars paid tribute and shared their memories of the celebrated actor.
See the video below for more on Perry's life and legacy.
Tori Spelling Slams the Oscars for Leaving Luke Perry and Late Father Aaron Spelling Out of 'In Memoriam'