Seven-year-old Logan Mountcastle, who was diagnosed with an incurable genetic disorder in December, was all smiles as he tied the knot with mother Joelean in the pretend wedding.
Brave Logan was found to be suffering from Leukodystrophy, which affects the brain and nervous system, and told he has anywhere between three and 15 years left.
Dozens of friends and family turned up to Gainsborough Liberal Club in Lincolnshire to witness the Beauty and the Beast-style event.
Guests were reduced to tears as little Logan, dressed as dashing prince, went down the aisle with Joelean, who said she was "overwhelmed" by the lovely day.
She told Lincolnshire Live: "Family and friends have contributed to make this party such a good event. We've got memories that we will always cherish.
"He's always said that he wanted to marry mummy, which I thought was a bit bizarre, but he is never going to get the chance when he is older and he has certainly enjoyed himself.
"And you can tell how much he has enjoyed it. He is overwhelmed. All the children have been excited and counting how many sleeps there were until today.
"When he watches Beauty and the Beast he was always laughing - now he's got what he wants and any mum would want that."
Instead of reading traditional wedding vows, Joelean made a promise to Logan, telling him she would always keep him safe.