An American woman's 21st birthday this year is tinged with sadness - it will be the last time she will receive a card and bouquet of flowers from her dead father.

Just before he lost his battle with cancer at 56, Michael William Sellers arranged to have flowers delivered to his 16-year-old daughter every year on her birthday, just to let her know he was thinking of her and loved her. He prepaid to have the floral arrangement sent for five years.

In a heartbreaking post on Twitter, Bailey, from Tennessee, the US, shared the last gift from her dad.

This year's message said: "I will still be with you with every milestone, just look around and there I will be."

Sellers shared photos of the flowers, the card and a childhood photo with her father at the beach to her Twitter followers.

Her father’s gesture, combined with his message on the card, touched people the world over.

On Saturday morning, Sellers tweeted gratitude for all the messages she’d received.

“"I'm so glad that my dad’s thoughtfulness brought so many people happiness.”