Head over heels for each over 20 years on, that's the message the Prince and Princess of Wales portrayed to the nation this morning with the loving image they shared on social media.

Happiness pours out from the picture, a still from a video that meant so much to the family of five.

It came after an incredibly difficult time for Kate, William and their three children following the uncertainty that a cancer diagnosis brings.

But the image and three-minute clip, show that the family emerged stronger. They’re an extremely secure unit, and the challenging period they faced only brought them closer together.

The couple's decision to mark Valentine’s Day publicly for the first time also showcases their determination to shine a light after so much darkness.

The past 12 months brought untold challenges and the prince and princess are different because of it.

Their love for each other has only grown, and this is reflected in the shift in their public communications.

Last September’s video gave a candid insight into family life behind the scenes, as images of picnics, card games and time on the beach were played for all to see.

Kate and William have become more open about expressing their love and being the driving force of their own narrative.

This is characterised by the release of personal videos, pictures and messages.

Just last month, the future king took the unprecedented step of sharing a deeply personal message to his wife as she celebrated her 43rd birthday.

He spoke of pride and strength, something the entire family has shown in spades as they grappled with not one but two cancer diagnoses.