Following the final of The Voice at the weekend, Simon tweeted in the early hours of this morning: "Congratulations to Jermain the winner of the voice uk. You deserved it."
Jermain stormed to victory on the BBC talent show despite the odds, proving the show's third shock winner in as many years.
And needless to say he partied hard throughout the night at the show's wrap party with his fellow finalists and the show's coaches, although no booze was involved.
Jermain told The Sun newspaper today: I partied until 5am. I celebrated with my family, friends and present and past contestants — plus the coaches and presenters Emma Willis and Marvin Humes.
“But I haven’t got a hangover. I’m just being me.
“If I can be me and inspire people then I’m grateful to be seen as a role model.”
Meanwhile Simon Cowell is getting ready for the return of Britain's Got Talent, which kicks off this Saturday night on BBC.
He tweeted: "I just watched the first cut of Britains Got Talent. It is fantastic."