Michael Douglas' sweet birthday post for Catherine Zeta-Jones didn't exactly have the intended effect. The "Basic Instinct" star, who interestingly enough was actually born on the same day as his longtime wife, took to Instagram on September 25, 2025, to celebrate their special day, writing, "To my birthday sister — what a joy it is to celebrate another year with you." While some commentators found the message adorable, others expressed confusion about Douglas' choice to call his wife his sister. Granted, they do share a birthday, but the actor could have used more appropriate verbiage to describe the happy coincidence.

Thankfully, the "Wednesday" star didn't refer to her husband as her birthday brother in her own post, gushing , "Sharing this special day with you is once in a lifetim

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