Inspired by a young Brighton fan who held up a sign successfully asking for Chelsea star Eden Hazard's shirt, in a move that made national headlines, 10-year-old Georgia Strickland made her own for Saturday's FA Cup tie against Preston at Bramall Lane.
And Georgia's dad Steven tweeted a picture after the game of Handsworth Girls star Georgia with her new prized possession, a move that attracted praise for Blades skipper Sharp - who scored the winner from the penalty spot as United went through to the fifth round.
"Thank you Billy for making Georgia’s day," Steven said.
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"What a top man. "It took her all week to make after she saw the Chelsea lad on TV!"
Sam Blackburn replied: "It’s why I love my club! Great captain role model and all round nice bloke!"
And Jamie Robshaw added: "Blades for life, well done Billy.
"Just about to start to knock my sign up for Tuesday - look for it at back of the Kop."
Georgia and Steve, from Charnock, watched the game from the Bramall Lane South Stand.