The trio were voted through to Saturday's final earlier tonight (May 8) after their performance of self-penned track 'Lovesick'.
After their performance, Cowell hinted at signing the group by saying he knew who they should work with in the studio.
He told them: "It was brilliant. Brilliant, brilliant, brilliant. You have come along at the right time, you are current, I know who you should be working with on your first album, I can hear that single already.
"This is the real deal! The song is genius and you have a great chemistry."
Later on Britain's Got More Talent, Amanda Holden stated that the band will most likely get signed by Cowell whether they win the competition or not.
"They have a really good chance of winning. If they don't win they'll be signed. They've got a future. [Simon] has mentally [signed them already]," she said.
Loveable Rogues described their win as "decent" and "bangin'" after the results were announced.
The 11-year-old singer Molly Rainford also made it through to Saturday's live final.
Britain's Got Talent continues tomorrow (May 9) for its third semi-final from 7.30pm on ITV1.