Entertainment TV Katie Holmes' Dawson's Creek Costar Mary-Margaret Humes Celebrates Their 'Forever' Friendship in Birthday Tribute "In a world full of muffins … You are one sparkly cupcake," Humes wrote By Angel Saunders Angel Saunders Angel Saunders has been a writer at PEOPLE since 2023. She’s previously worked at iHeartMedia, IndieWire, and REVOLT. People Editorial Guidelines Updated on December 19, 2023 12:40AM EST Mary-Margaret Humes and Katie Holmes. Photo: Mary-Margaret Humes/instagram Mary-Margaret Humes is wishing her Dawson's Creek costar Katie Holmes a very happy birthday! “In a world full of muffins … You are one sparkly cupcake!!!” the former TV mom, 69, began in an Instagram tribute to Holmes, who turned 45 Monday. “🧁Happy Birthday sweet friend @katieholmes We love you so very much ❤️❤️😘😘 #dawsonscreek #tvfamily #foreverfriends 🍷🍷.” Humes shared two photos of the ladies together. The first was a throwback picture of them sitting together as they smiled and looked at a cupcake with a single candle on top. The second photo appeared to be more recent and showed the pair laughing together over a glass of wine. “Thank u so much! You are so kind always!” the Batman Begins actress commented on the post. Holmes and Humes in the teen drama series that followed a group of friends living in the fictional town of Capeside, Massachusetts. The show ran from January 1998 to May 2003. 'Dawson's Creek' cast. Columbia/TriStar International Television The hit series also featured James Van Der Beek as Dawson's Creek's title character Dawson Leery, Michelle Williams as Jen Lindley, Joshua Jackson as Pacey Witter and Kerr Smith as Jack McPhee. Humes played Dawson's mother Gail, while Holmes starred as his friend, Joey Potter. The Cast of 'Dawson's Creek': Where Are They Now? Throughout the years, the cast has remained close. In March, Van Der Beek, 46, revealed that Humes continues to play an important part in his life, especially on his birthdays. "Every year since my mother died, [Humes] makes me cookies and sends them to me on my birthday," the actor captioned a clip on his Instagram Story at the time. "I have the best TV momma on the planet." Katie Holmes Reveals She Watched 'Dawson's Creek' with Daughter Suri, 16: 'We Had a Good Laugh' "Okay guys, what do we got?" he asked his children in the sweet video. "From Margaret, every year, on my birthday." Later that month, Humes was present to support Holmes at her off-Broadway show The Wanderers. JC Alvarez, John Wesley Shipp, Katie Holmes, and Mary-Margaret Humes. Katie Holmes/Instagram "Thank you @thereal_margaretmaryhumes and @johnwesleyshippjr for your support and love!" the Alone Together actress wrote on her Instagram Story as the old friends were joined by John Wesley Shipp, who played Humes’ Dawson’s Creek TV husband Mitch Leery, and friend JC Alvarez. During ATX TV's Mother Knows Best: A Look at '90s TV Moms panel in March 2021, Humes opened up about whether or not fans would ever see the Capeside residents together again on television. Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories. "There has been a secret text message going around among all we actors," she said. "Katie Holmes and I have talked about it extensively. James Van Der Beek and I have talked about it." "I actually wrote like, 190 pages of an idea for a crossover to a reboot," Humes continued. "Whether it goes anywhere, I don't know. But there's certainly a lot of buzz about it."