Charlie XCX
Jesse Jenkins

"She's cool, but it just wasn't right," says the songwriting phenom of Xtina.

Charli XCX is still sharing the No. 1 spot on the Hot 100 chart with Iggy Azalea, as "Fancy" spent a fifth week atop the chart last week. The U.K. singer-songwriter guested on another Top 10 smash, Icona Pop's "I Love It," last year. Sadly, however, she had the opportunity to forge yet another collaboration -- with Christina Aguilera -- but passed on said opportunity.

"I've passed up on many a thing that could have made me a big artist or something," XCX says in a new interview with Popjustice. "Like I was offered a feature on a Christina Aguilera song and I turned it down. It just wasn't right. She's cool, but it just wasn't right."

Other revelations that the "Boom Clap" singer dropped in the sprawling interview: her full-length follow-up to last year's "True Romance" was supposed to be a "punk album," but that album -- which was finished -- has been scrapped for something more radio-friendly.

"I was over the music industry, I was over all of it. And I went to Sweden and made a punk album," she explains. As for what will actually come out, XCX says, "I've made a pop record. I think it'll be completely finished by the end of July, I'm not doing any more writing sessions now … I still want to put out all the stuff I did in Sweden. That is going to happen at a later point."

Charli XCX on 'Fancy' Fame: 'I Feel Valued'

So who has Charli been working with on this new album? "Weezer, Rostam from Vampire Weekend, Stargate, John Hill," the singer-songwriter lists. The 21-year-old also worked with Dr. Luke, but on material for another (unnamed) artist, not her own album.

"Boom Clap," XCX's single from "The Fault In Our Stars" soundtrack, has peaked at No. 29 on the Hot 100 chart. The singer confirmed that the single will indeed appear on her as-yet-untitled next album.