The singer was getting ready for the live final, that sees her take part in a group performance with fellow coaches will.i.am, Tom Jones and Ricky Wilson.
Speaking before the final, Kylie, 45, said she was still unsure whether she will rejoin the hit BBC singing show for a second series.
“This contest is like a horse race,” Kylie said. “You think one singer is in front and then someone overtakes them.”
She is due to play a number of live shows later this year and says she does not know how her performances would fit around the filming commitments.
The final of the 2014 series sees Kylie’s singer, Jamie Johnson, face Sally Barker, Christina Marie and Jermain Jackman as they all compete for a record deal.
The Voice, BBC1, 7.00pm, Saturday, April 5