Charli XCX confessed last month that she initially wrote her hit “Boom Clap” for Hilary Duff, only to to be told it wasn’t cool enough. The news “crushed” Charli XCX, though based on a new interview, Duff sounded bummed as well. Turns out, she had no idea that The Fault In Our Stars single could have been hers. “I didn’t know that I had an option to have it,” Duff says to Popjustice. “It’s my favorite song on the radio right now.”

Duff does recall that while prepping her new album, plans to write with Charli XCX didn’t pan out. She has ended up instead with “folkier-type” music, as inspired by Mumford & Sons and The Lumineers. Meanwhile, Charli XCX’s “Boom Clap” rose this week to No. 14 on Billboard’s Hot 100, making for her biggest solo hit to date. “If she wants to give it to me now, I’ll still take it!” Duff joked. Until they do work out a collaboration, here’s to hoping that the Metamorphosis star covers the song live.

Read the rest of Duff’s interview at Popjustice

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