Tech billionaire turned party girl, 32, plans to sue her TV star ex-girlfriend after lurid sex and drug claims she says are false, court papers show

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Lucy Guo said she planned to take legal action against the British actress Wallis Day in a declaration made to a federal court.

Published: 16:47 GMT, 11 November 2026 | Updated: 16:50 GMT, 11 November 2026

An ultra-rich tech investor turned DJ says she is preparing to sue for defamation after her TV star ex-girlfriend made a series of shocking claims during their break-up, court papers have revealed.

Lucy Guo, a 32-year-old AI entrepreneur who was once lauded as the world’s youngest self-made female billionaire, said she planned to take legal action against the British actress Wallis Day, 32, in a declaration made to a federal court.

Details of the couple's spectacularly messy split emerged in a petition Guo made to the United States District Court for the Northern District of California to enable her to subpoena Instagram owner Meta.

The eccentric Scale AI co-founder is seeking information about the reach of a post that she said Day, who has 425,000 followers, made on Instagram. In her declaration, she claimed the post was defamatory and that she intended to bring a lawsuit against Day in the UK courts.

The declaration stated: 'Guo posted an Instagram story to publicize and promote her latest single/remix titled “Done with your ex,” along with the caption, “fun fact: I broke up with my ex the night we made this".

The declaration claims that Day, who starred in the CW TV show Batwoman, reposted Guo's remarks and added the caption: 'Broke up with me lol…tried to get me to sign a prenup, came in wasted and tried to have sex, I told you no & left. Then stole hundreds of thousands worth of my belongings to coerce me into signing an NDA with hush money. I refused.'

The court filings said the caption continued: 'Because everyone should know how dangerous Lucy Guo is. But continue your narrative. Everyone knows the truth. Watch out guys, this person refused to let emergency services into their house when someone was dying because they had drugs everywhere #narcissist.'

In her declaration, Guo denied the accusations allegedly made against her, describing Day’s Instagram story as ‘replete with falsehoods’.

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