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The news was announced during Sunday night’s Wembley Arena results show, at the end of a 2-hour show, which included guest performances from Adele, Coldplay and One Direction.
Louisa was understandably delighted to triumph over Reggie 'N' Bollie, and her winner’s single is a cover of 'Forever Young'.
Watch her perform the track here (story continues below)...
Moments after the announcement was made, the singer shared her delight at her win, telling Olly Murs and Caroline Flack: "You have no idea how much this means to me, thanks you so much.
Louisa's mentor Rita shared her delight at the win, labelling Louisa "the cutest, most gorgeous and hard-working winner".
"Thank to everybody and Simon for this experience," the judge added. "It's truly been incredible."
Reggie 'N' Bollie also praised the show, remaining insistent that they're delighted to have had the chance to take part, stating: "We are never devastated that we lost, we came here empty handed and we leave full of music."
Cheryl Fernandez-Versini added: "They've been absolutely incredible, everyone this season has been so talented, and Louisa, well done, but for these two, it's just the beginning."