An American woman gave her father the best surprise of his life when she told him he was going to be a grandfather.

Jessica Hickey met her father in a restaurant before springing the news in a note attached to a baby's soother. Writing on Reddit, Jessica says that her mother died 20 years ago and that her father has been asking about a grandchild since her wedding day.

As you would expect, his reaction is absolutely heart-warming. And it's just as well she filmed the event because it's the sweetest video you're likely to see today.