Kate Middleton shares adorable never-before-seen photo of her playing with George and Charlotte

Kate Middleton is spreading the love for Mother's Day in the UK today!

Taking to social media overnight, the Duchess of Cambridge paid a touching tribute to "mothers new and old" with a series of never-before-seen family photos as well as a sweet handmade card Prince George made for his mother.

The first photo shows the royal mum and her husband Prince William giving their two eldest children piggybacks in the garden of their Norfolk home.

The heartwarming photo is reportedly an outtake from the Cambridge family's 2018 Christmas card photo shoot.

The second photo shows a young Prince William throwing his arms around his late mother Princess Diana, while Prince Harry cuddles up next to her.

Kate has also shared a photo of her mother Carole cradling her as a baby - which was taken in 1982.

The final photo is a sweet picture of the handmade card Prince George made for his mother to celebrate the day.

Alongside the series of touching throwback photos, Catherine wrote: "To mothers new and old and families spending today together and apart – we are thinking of you all at this difficult time. Happy Mother’s Day."