Joking about Walsh's new cut, she suggested that he was using "miracle sprout" on his locks.
Watch Contostavlos and the X Factor Girls talking to Digital Spy below:
The reality TV judge told Digital Spy that the upcoming X Factor Live Shows would be "distressing and nerve-wracking" for herself and her acts, claiming that it isn't as exciting for the people involved in the show as it is for viewers.
"I'm ready for it. I can handle it. I wouldn't classify it as exciting," she said. "It's exciting as a viewer, but it's distressing and nerve-wracking as a judge and a contestant.
"I'm sure everyone will have a lot of fun at our expense."
She also claimed that Simon Cowell has taken a hands-off approach with this year's series, only dealing "behind-the-scenes with producers" rather than the judges directly.
Copyright: Rex Features Ken McKay/Rex FeaturesSpeaking about how she would prepare Ella Henderson, Jade Ellis and Lucy Spraggan for the media and fan attention that awaits them, Contostavlos commented: "I can't prepare them. There is no preparing. You can only say the same thing over and over again, 'Let it go over your head'."
The X Factor Live Shows start this weekend on ITV1.