The Zeta-Jones-Douglas love train is clearly still running at full speed, with Zeta-Jones sharing a second celebratory post in honor of Douglas, a candid shot attributed to their "friend," Simca heir Jean Pigozzi. "Happy Birthday to Michael and to me!! This was us on our birthday 25 years ago! I love you with all my heart."

Catherine Zeta-Jones posted a naked picture of herself in honor of the birthday she shares with husband Michael Douglas.

Catherine Zeta-Jones embraced her birthday suit in celebration of Michael Douglas’ 80th birthday on Wednesday. As a present to her husband of 24 years, the “Entrapment” star shared a revealing snapshot of herself on Instagram, which showed her leaning against a bathroom vanity with nothing on except a pair of sky-high heels.