ET talked to the 'Witness' singer and her 'American Idol' co-judges, Lionel Richie and Luke Bryan, after Sunday night's elimination show.
Katy Perry appreciates the importance of pleasantness and friendly professionalism.
Perry recently extended an olive branch to fellow pop-star Taylor Swift after several years of low-key feuding and shade throwing.
Now, the American Idol judge is using her actions as the basis for some advice she has for young performers and Idol hopefuls as they begin to make their way into the music business.
"In the beginning, it's gonna be a whirlwind," the Witness artist told ET after Sunday's American Idol taping in Los Angeles. "They're gonna be holding onto their wigs for dear life."
As for her important tips, Perry feels it's important to "just and be as pleasant as possible and take everything with a Himalayan grain of salt."
"And trust the people that brought you here," she added. "Keep them around."
As her fellow judge Luke Bryan explained, "There is no pamphlet or tutorial, there's no Hollywood for dummies."
"If you read into all the music business, acting, movies, then you wouldn't get into it. You gotta be naive, you gotta stumble into it," the country singer shared. "When something comes up, when something comes up, you just gotta be like, 'Oh my god, my life's over today. But alright, we're back!"
Idol Judge Lionel Richie echoed his co-stars' advice, before sharing a bit of wisdom on the importance of being ready for your shot.
"When the light turns green there is no such thing as vacation," he explained. "Take it! Go! Go! Go! I can't tell you how many people have said, 'I got a number one record, I'm going on vacation,' and you never heard from them again. I'm now 41 years of overnight success."
On Monday's American Idol, the field of singers got cut down to the final three after a night of powerful performances and a guest appearance by Carrie Underwood, who sang "See You Again" alongside the Top 5 contestants before delivering a solo performance of her new single, "Cry Pretty."
All five competitors performed twice on Sunday, first singing a classic tune by Underwood before delivering a song of their choice.
The two contestants who got sent home this week were Michael J. Woodard and Cade Foehner. Woodard first sang Underwood's 2007 single "Flat on the Floor," followed by Yolanda Adams "Still I Rise." Meanwhile, Foehner belted out Underwood's 2010 bluesy "Undo It," followed by Lynyrd Skynyrd's "Simple Man."
Ultimately, the contestants moving on to the Final 3 are frontrunner Gabby Barrett, along with Caleb Lee Hutchinson and Maddie Poppe.
American Idol's two-night season finale kicks off live next Sunday at 8 p.m. ET/PT on ABC.
For more on why Perry apologized to Swift after years of bad blood, watch the video below.
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