"Happy 102nd birthday to the most beautiful man," Zeta-Jones wrote in the caption. "We love you Kirk."
Her husband of 18 years, Michael Douglas, offered up an emotional tribute to his father when the younger Douglas received his star on the Hollywood Walk of Fame last month.
The magnitude of Michael Douglas receiving his star on the Hollywood Walk of Fame was not lost on the actor.
But it was the presence of his father, 101-year-old Kirk Douglas, in a wheelchair, that made the younger Douglas emotional at the ceremony.
"It means so much to me, Dad, that you're here today," Douglas said, noting that his father turns 102 in a month. "Thank you for your advice, inspiration, and I'll say it simply, with all my heart: I'm so proud to be your son."
As Michael Douglas celebrated 50 years in the industry, he was surrounded by friends and family, including son Cameron, brother Joel and wife, actress Catherine Zeta-Jones.
He played tribute to his spouse, whom he called the "love of my life."
"I'm talking about Catherine," Douglas said. "Thank you, darling, for your support and your love and your patience. By the way, in another week we're celebrating our 18th anniversary, so thank you for the best 18 years of my life, sweetheart."
Douglas's The China Syndrome co-star Jane Fonda, his former agent Ron Meyer, Will & Grace star Eric McCormack, and Douglas's Black Rain co-star Andy Garcia were also present at the ceremony.
Douglas jokingly made sure to plug his new Netflix comedy series The Kominsky Method.
"Some would use this opportunity to talk about my new Chuck Lorre [who created the series] Netflix show 'The Kominsky Method," he said. "Not me."