“Ain’t My Fault” is the eleventh track on Zara Larsson’s international debut So Good. It was released as the album’s third single on September 2, 2016. A music video was uploaded to Larsson’s YouTube channel on September 30, 2016. It peaked at #1 in Sweden, and reached #76 on the Billboard Hot 100.

BBC Radio 1 explained how the song evolved over time:

The first version of the song was written about stealing another girl’s boyfriend but when her record label and management fell in love with the track, Zara quickly rushed back into the studio to change all that.

I can’t be Becky With The Good Hair, it doesn’t make sense, I would never be proud of stealing a girl’s man and sing about it, it would be very not me. So we have changed the lyrics and now I can proudly sing it without hurting anyone’s feelings. When we wrote it we just wrote it for fun and people loved it, but then I was like whoa whoa whoa I can’t sing this.