Los Angeles, California - Billie Eilish is back on top of the music charts thanks to What Was I Made For?, her latest release that dropped as part of the Barbie soundtrack.

The 21-year-old's hit jumped to the top spot on Billboard's Hot Rock & Alternative Songs chart for the week of August 12, overtaking the record held by Taylor Swift for the most No. 1 hits by a solo female artist on the chart.

What Was I Made For? is the most melancholy of the Barbie movie's songs, and it has found a new level of popularity as a backing track to viral "girlhood" videos on TikTok.

Earlier this week, the track became the fastest song from a soundtrack to reach 100 million streams on Spotify.

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The Ocean Eyes singer recently debuted What Was I Made For? live with an emotional performance during her headlining set at Lollapalooza.

Eilish has credited the collaboration with saving her from a slump of "self-doubt" and revealed she pulled from her own personal experiences in writing the track, despite originally planning to focus on the movie's titular character.

"I do this thing where I make stuff that I don't even know is…like I'm writing for myself, and I don't even know it," she said of the song.