Michael Douglas Calls Catherine Zeta-Jones His ‘Birthday Sister’ in Sweet Post

LOS ANGELES, CA — Fans of Michael Douglas and Catherine Zeta-Jones are puzzled after Douglas referred to his wife as his “birthday sister” in a recent social media post. The couple celebrated their shared birthdays on September 25, with Douglas turning 81 and Zeta-Jones 56.

Douglas shared a heartfelt photo on Instagram with the caption, “To my birthday sister—what a joy celebrating another year with you! Congratulations on your spectacular game at the Celebrity Ryder Cup. Happy Birthday to the love of my life @catherinezetajones 💖🎉🎂.” Zeta-Jones responded with a sweet message of her own, saying, “Happy birthday darling! I can’t think of anyone else to share a birthday with.❤️.”

The term “birthday sister” sparked confusion among fans, leading some to wonder about its meaning. However, this is not the first time Douglas has used this term for his wife. In 2024, he referred to her similarly, demonstrating the couple’s inside joke.

Zeta-Jones’ birthday tribute lacked any pet names, leading to more speculation. She posted a series of photos with the caption, “Happy Birthday Michael! Sharing this special day with you is once in a lifetime! 😊.”

The couple first met in 1998 at the Deauville American Film Festival in France, introduced by actor Danny DeVito. They married two years later in November 2000 and have two children, Dylan and Carys.

In August 2013, the couple briefly separated, but they reconciled shortly after. Zeta-Jones once stated, “I find divorces repulsive. I will never get divorced, never,” reinforcing their dedication to each other.

Fans continue to celebrate the couple’s enduring love, especially on this special occasion. Many took to social media to express their support and delight at their heartfelt exchange.