Look what you made her do.

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Haters gonna hate, hate, hate. And Taylor Swift’s gonna sing, sing, sing, sing about it to stadium filled with tens of thousands of her biggest fans—at least such was the case on Saturday, when she performed the diss track “thanK you aIMee” for the first time during the second night of her Eras Tour show in London.

The song strategically capitalizes the letters K,I, and M in the title and is believed to be about her longstanding feud with Kim Kardashian, which the pop star seemingly reignited with her debut performance. In a fan video posted to X, Swift first revealed how “insane” it was that she gets to perform at Wembley Stadium eight times this summer, before introducing the new song to her set list.

“Clearly you thought this was a good idea, you believed we could do this, you wanted this to happen. It blows me away. I’ll spend forever trying to thank you properly for that,” she said to the crowd while strumming her guitar. Swift added, “But then on the other hand, it really makes me think about how every time somebody talks shit, it just makes me work even harder and it makes me that much tougher.”

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“I’ve never played this song before, wish me luck,” Swift concluded as she began to play “thanK you aIMee,” in which she sings about a high school bully who fans think is Kardashian given the lyrics about Aimee’s “fake tan” and how she “stomped across” her grave (Swift crawls out of a grave in her music video for “Look What You Made Me Do”—another track that’s about her drama with Kardashian and the reality star’s then-husband Kanye West).

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Last year, Swift opened up about her 2016 feud with Kardashian and West while speaking with Time. “That took me down psychologically to a place I’ve never been before,” Swift said of the leaked phone call between her and the rapper that Kardashian posted to social media. “I moved to a foreign country. I didn’t leave a rental house for a year. I was afraid to get on phone calls. I pushed away most people in my life because I didn’t trust anyone anymore. I went down really, really hard.”