The 'Judas' star joined in-show mentor Jimmy Iovine to offer her advice to the Top 4 ahead of this week's live Wednesday performance show.
"I think that a lot of the young kids on this show would never normally be heard and it's really nice to be a part of helping young people be heard," she said.
"I'm not interested in judging them. I'm here purely to be a friend and give them a sense of inspiration and confidence and help bring out what is really special about them."
Among the advice that she offered was telling James Durbin to move his body more while tackling an Elvis Presley track. She decided to loosen him up by approaching him from behind, grabbing his hips and encouraging him to dance with her.
"When you move those hips you look sexy and it puts the song in your body," she said.
During her one-on-one time with 16-year-old Lauren Alaina, the Born This Way star also admitted that she didn't think she would have landed a place on American Idol if she'd tried to audition when she was younger.
"I was way too weird to be on American Idol when I was 16," she told Alaina. "They would have shut the door in my face."
Iovine added that GaGa was a "good match" to be mentoring Alaina, pointing out that the pop superstar can relate to young girls and their insecurities, and is a good role model for them.
American Idol continues tonight at 8/7c on Fox.
> American Idol recap: Top 4 Perform
> American Idol pictures: Top 4 Perform