The host of the BBC singing contest described Kylie as “the loveliest, warmest, kindest” woman, and said she will be difficult to replace.
The Australian pop star quit The Voice after one series to concentrate on her own music career.
Considering a possible replacement, Emma said: “There’s always Madonna, if she’s not busy!”
Emma says: “We were lucky to have Kylie. She was my idol as a teenager – I had the perm – so I was nervous about meeting her; but she puts you at ease. She’s the loveliest, warmest, kindest person.”
Emma, 38, who also presents Big Brother, also revealed that swearing is her “guilty pleasure”.
She said: “I can’t swear at work or at home, so when I go out, I really swear!”
And approaching her 40th birthday does not worry her.
“I see women who get hotter as they reach 40: Liz Hurley, Victoria Beckham. And I feel I’m being taken more seriously in my career as I head closer to 40.”