The Prince and Princess of Wales's photo is the first time the couple, who were married in 2011, have released a photograph to mark Valentine's Day.
The picture is a still taken from the video released last year when the Princess of Wales announced her cancer treatment had ended.
The video showed her spending time with her husband, Prince William, and their three children, as she said her focus was on "staying cancer free".
The caption reads: "Back home taking care of our babies, and missing my Valentine, as he continues on at the Invictus Games, changing lives and reminding all of us of the power of healing and resilience through these incredible veterans and their families.
The Prince and Princess of Wales and the Duke and Duchess of Sussex have marked Valentine's Day by sharing a romantic picture.
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