"Being nasty is not fun - viewers are sick of people not being very nice to each other. It is about enjoying the acts," thesun.co.uk quoted Bunton as saying.
"I am going to be fair. I know what it feels like to be in an audition and I want to pick up on the positive side. But I am not very good at lying and so I am sure my face will tell you the story," added the 37-year-old, who was a member of band Spice Girls.
J. Jayalalithaa passes away: Her life in pictures
Photos: Shah Rukh Khan, Deepika Padukone, Alia Bhatt at an awards show
Photos: Big B, Iulia Vantur at Himesh Reshammiya's album launch
Photos: Aamir Khan with 'Dangal' actresses at fashion show
Spotted: Twinkle Khanna, Shriya Saran at an event in Mumbai