Tissues required.

Bailey Sellers' late father has been sending her flowers on her birthday every year since she was 16.

Bailey's dad, William Sellers, was diagnosed with pancreatic cancer in 2013. A month before he died—at the age of 56—he arranged for his beloved daughter to get a flower delivery on her birthday every year until she turned 21, Fox reported. Last week, on her 21st birthday, Bailey received one final delivery, only this one came with a heartfelt note.

(Get those tissues out, folks.)

"Bailey, this is my last love letter to you until we meet again. I do not want you to shed another tear for me my baby girl for I am in a better place," he wrote. "You are and always will be the most precious jewel I was given. It is your 21st birthday and I want you to always respect your momma and yourself. Be happy and live life to the fullest. I will still be with you through every milestone, just look around and there I'll be."

In a tweet that has since gone viral, Bailey shared three photos: one of the note, another of the flowers, and an old picture of her and her dad. In just a few days it has already been more than 350,000 times.

"My dad passed away when I was 16 from cancer and before he died he pre payed flowers so i could receive them every year on my birthday," the Knoxville native wrote on Twitter. "Well this is my 21st birthday flowers and the last. Miss you so much daddy."

Wow. It doesn't get sweeter than that, does it?