With their saxy new single "Problem," Ariana Grande and Iggy Azalea just made history by notching the highest debut ever between female soloists. Coming in at No. 3 on the Hot 100, the collaboration also scored the eighth-largest debut for downloads, selling 438,000 digital copies last week.
To celebrate the female team-ups owning the charts, we've put together a playlist of 35 incredible girl-on-girl collabos. From the latest chart-toppers to classic diva duets, these songs are proof that you can't keep the power of two—or three! or more!—female acts contained.