Will.i.am has revealed he and Michelle John have already recorded a song together.
The Black Eyed Peas star is heading into the final this weekend with Michelle as his last remaining act.
The pair are set to duet on the show and have spent time in the studio this week ahead of Saturday's live episode.
"I was in the studio with her yesterday and produced a song with her which is really fun," Will teased.
Michelle added: "It's awesome!"
Speaking at a press conference ahead of the final. Will continued: "It's heartfelt, she delivered all the emotion, all the power, she's amazing."
Quizzed on what Michelle needed to do to win The Voice 2017 this weekend, Will advised: "You just have to be truthful and honest with how you feel and project it out to the audience.
"It's not about how great you sing now, everyone sings great, it's about that next layer and that next layer is connecting with people."
A total of four singers - Michelle, Mo Adeniran, Jamie Miller, and Into The Ark - have made it through to the first half of the final this Saturday night (April 1) which airs at 8:30PM on ITV straight after Ant and Dec's Saturday Night Takeway.
At the end of that episode, one of the acts will be eliminated leaving three to continue forward to Sunday's show, airing at 7PM on April 2.
The duets will air on Saturday night's show ahead of the weekend's first elimination.
"Working on something special with @intothearkmusic for @thevoiceuk final this weekend! #TeamTom" Sir Tom Jones teased ahead of his duet with Into The Ark.
And Team Jennifer's Jamie Miller posted on Twitter: "I cannot believe I'm saying this but I'm dueting with my coach @IAMJHUD this Saturday on @thevoiceuk !!!!!"