Jules O'Dwyer and her dog Matisse were the ninth winners of Britain's Got Talent.
They beat 12 other finalists to take home £250,000 and earn a spot at this year's Royal Variety Performance.
O'Dwyer thanked everyone who had voted, and joked about the Royal Variety Performance saying: "I'm going to have to buy a corgi."
The other two top acts were choir Cor Glanaethwy and magician Jamie Raven.
Raven landed in second place after wowing the judges by making a bank note signed by judge Alesha Dixon appear in the middle of a lemon.
On coming second, Raven said: "To be honest, I think, technically I was the most talented human being. I just want to say thank you to everyone who voted."
Ant celebrates by French kissing Matisse
Out of the final 12, two were announced on the evening as wildcard choices, with the public wildcard vote going to nine-year-old Jesse-Jane McParland and the judges' wildcard choice was dance group, Boyband.
TV hosts Ant and Dec said the show had received a total of four and a half million votes.
The top nine spots went to, in order from last to fourth: Boyband, Entity Allstars, U D I, The Neales, Jesse-Jane McParland, Danny Posthill, Calum Scott, Isaac Waddington and in fourth place, Old Men Grooving.
Amanda Holden, left, and Alesha Dixon make their entrance
Guest performers on the show were Lord of the Dance's Michael Flatley and singer Andrea Bocelli.
Flatley confirmed on the show that his BGT performance would be his last UK TV performance.
Michael Flatley performs on the show
Other highlights from the show included choir Cor Glanaethwy, whose performance judge David Walliams described as "completely magical". He went on to joke saying: "It made me so proud to be a quarter Welsh."
The judges also praised singer Isaac Waddington, with Cowell saying: "Isaac, that was fantastic. Fantastic. No gimmicks, no tricks, but what I loved about it was you were in complete control of the song.
Jamie Raven performs
"You have improved so much from when we first met you. I thought I knew who was going to win and I may have changed my mind now."
Old Men Grooving's wedding-themed performance was a hit, with Dixon telling them: "That was great fun. You guys are fabulous."
Lowlights included Calum Scott forgetting his words during his rendition of Rihanna's hit, Diamonds.
Cowell said: "It fell apart the first part of the song. Luckily on the second half of the song you picked it up. So, all I can say is I hope that people judge you on the second half."
Holden tweeted a picture of herself backstage with One Direction's Niall Horan and Louis Tomlinson, writing: "Finally two Prince Charmings turn up at once!"
Walliams tweeted after the show saying: "The British public do love dogs!"