"And, I love the fans that truly made this show a piece of television history. You grew up with us. You believed in us. You supported us. You loved us. You cheered us on. Your hearts broke when our hearts broke. You believed in our fashion choices. You believed in our friendships. You believed whole heartedly in Brandon, Brenda, Kelly, Dylan, Steve, Andrea, David, and Donna. And, every other character that graced our zip code," Spelling shared.
"Our fans, this day is truly dedicated to all of you who lived thru our experiences by watching us. You mean the world to us! We are eternally grateful to our fans who have truly become friends to us," she concluded. "We celebrate you today and everyday! Xoxo"
Jennie Garth, meanwhile, shared a classic throwback photo to a cast pic from back when the show first began in 1990.
"Seems like yesterday!" Garth wrote. "Happy 30th Anniversary to my 90210 family and all the incredible people who contributed to making this show part of television history 📺 And most of all to our amazing fans! Love you all!"
Meanwhile, fellow stars Brian Austin Green and Shannen Doherty commemorated the occasion as well, with Green honoring the debut of his character, David Silver, while Doherty honored the milestone itself with a group pic.
On Sunday, in one of the most ambitious virtual reunions fans could hope for, the cast and creators got together via video chat as part of the Beverly Hills 90210 Show podcast.
The reunion included Spelling -- who dealt with connectivity issues throughout -- and Garth, as well as Jason Priestley, Ian Ziering, Gabrielle Carteris, creator Darren Star and many others.
Meanwhile, Spelling's celebration of the show didn't end there -- she and Garth announced the launch of their own Beverly Hills, 90210 podcast, which they're calling 90210MG.
"Me and my real life BFF @jenniegarth rewatching all our onscreen bff’s on 90210 and telling you about all the behind the scenes fun we had for 10 years!" Spelling explained on Instagram, while Garth joked, "I can’t believe these people are giving us microphones🎤🎧."