The singer-and-actress - who joined Randy Jackson on the judging panel along with Aerosmith star Steven Tyler earlier this year - found it "entertaining" when people at the recent Los Angeles auditions performed their versions of her hits, but has advised hopefuls on the star-search show to try a different approach.
She said: "It was cute, super entertaining and flattering, but no.
"I think everyone tried to be as honest as they can without breaking anyone`s spirits. They know we`re not out to cut them down or make a joke of them. We`re trying to mentor them to the next step."
However although some hopefuls have failed to impress, Jennifer admitted she is excited about the talent so far this season - even though the lengthy audition process is taking its toll.
She said: "We`ve put a bunch of people through - probably more than they have in the past.
"We have about 15-20 real superstars, people who could be recording artists.
"I`ve cried. We get a lot of elation when we put them through and devastation, almost, when they`re not. But it`s been a ball."
The 41-year-old star - who is known for her sense of style - has also promised to wear some amazing outfits on the show.
Speaking at a press conference for the show, she said: "Look, I`m just going to be me. Every day that`s something different. I like getting dressed up. That`s not going to change for this show."