Athlete with a heart of gold proposes to heart-broken six-year-old

A heart-breaking video of a six-year-old girl crying about not being able to marry NFL star J.J Watt has resulted in a miraculous response.

The girl is sat crying on the couch, lamenting the fact that she had to be 25 to marry J.J Watt. Not exactly true, but clearly the distressed lass wasn't thinking straight.

Watt, a defensive linesman for the Houston Texans saw the video and posted a message to Twitter asking for assistance in finding the forlorn fan.

In less than two days the little girl had been located and Watt conspired with her parents to organise an adorable surprise.

Down on one knee, Watt asked Breanna to be his wife for the day and the two shared a few hugs and posed for plenty of photos.

With the Super Bowl set to take place on Monday (10:30am EDST) it's good to see such a heart-warming tale out of the NFL.