In early 2014, Charli co-wrote and provided the hook for “Fancy,” the fourth single from Iggy Azalea’s The New Classic album. The rest is history, as the song surpassed “I Love It” for the biggest look of Charli’s career, spending seven consecutive weeks atop the Billboard Hot 100 chart. In a Billboard interview, Charli described her differing relationships to her two massive hits: “With ‘I Love It,’ there was never really a plan for me to go and write for Icona Pop—they were just there and it happened, and no one really knew what was going on…. I never really felt like it was my song. With Iggy, it’s been the flip side of that…. From the start Iggy has been like, ‘This is your song as well as my song.’ I feel valued.” Charli and Iggy’s hit-making chemistry didn’t end there. Charli also has co-writing credits on “Beg for It,” Iggy’s latest single, which will be featured on the reissue of The New Classic due out later this month. Charli initially provided the vocals for the song’s hook, though the final version features Swedish singer MØ instead. (You can hear the original version here.)