"I prefer to be honest. I think that's the best way to go. I wouldn't want to be told something and then waste seven years of my life. I feel like it's the thing to do."
The 52-year-old British mogul, who was appearing with her, interjected to reveal that Britney was swift and ruthless with her judgements and didn't flip-flop on her decisions, which he was very impressed with.
"I'm not disagreeing with you. I've been doing it for years," Simon told the blonde bombshell. "I've never heard someone say 'no' to contestants so quickly in my entire life."
"I was really nervous," she admitted. "You have all these people behind you, and you know they're rooting you on. It's a really exciting, electrifying thing to do."
Simon, Britney and fekkow judges Demi Lovato and L.A. Reid will be immortalizing their handprints at Grauman's Chinese Theater on Hollywood Boulevard today at 6 p.m. PT, with fans invited to watch the ceremony.
The X Factor premieres its second season on Wednesday at 8 p.m. ET.