Sia is opening up about her friendship with Katy Perry.

In a new interview with The Los Angeles Times, the singer spoke about meeting Katy in 2014 and becoming fast friends.

Katy even acted as Sia’s “pop-star concierge” during her rise to mainstream stardom. But their friendship became closer as they opened up about their individual internal strifes.

“She’s on stage with 10 candied lollipops and clowns and dancers, selling the dream, the joy, the happiness — and that’s really hard sometimes when you’re not feeling it yourself,” she explained.

“I knew she was driven and ambitious, that was clear from the beginning. But I didn’t realize that she was so reliant on that validation for her psychological well-being,” she continued. “She did say ‘I feel lost.’ I think it was a big kick to her ego, but it was the best thing that could have ever happened to her, really, because now she can make music for the fun of it. Getting No. 1’s does nothing for your inside.”

Now that’s a friend! Read the rest of the interview at People.