Make California Post a Preferred Source Billionaire party girl Lucy Guo is planning to sue her actress ex-girlfriend for spreading a wild claim that she refused to help a dying person inside her mansion, according to a report.
British TV star Wallis Day allegedly aired a series of allegations against Guo on her Instagram Stories in May following the end of the couple’s six-month relationship in February, the San Francisco Standard reported.
She also alleged Guo wanted her to sign a prenup, came home drunk and tried to have sex with her and stole hundreds of thousands of dollars of her belongings to pressure her into signing an NDA.
The allegations came to light after Guo appeared to be preparing to sue Day, filing a request for records from Meta in federal court Tuesday seeking to know who viewed Day’s Instagram story.
Guo, 32, has denied the allegations and is expected to file a defamation case against her ex-girlfriend, also 32, in the United Kingdom.
Her request seeks 18 categories of information, including when the story appeared and was removed, how often it was viewed or shared, and the identities and locations of people who saw it.
Knowing the number of viewers that were in Britain could help Guo establish grounds for her court case, Eric Goldman, a law professor at Santa Clara University, told The Standard.
Day, who starred in “Batwoman” and “Krypton,” posted the accusations months after the pair’s romantic relationship ended.
The former couple dated from July 2025 until February 2026 — before Guo said she broke things off, according to her court declaration.
“Thereafter, Day sought, unsuccessfully, to obtain hundreds of thousands of dollars from me,” Guo said in the filing.
The Instagram exchange began after Guo promoted a breakup song she made called “Done With Your Ex.”
Guo, who has a fortune of about $1.5 billion, according to Forbes, said she created it the night she ended a relationship, without identifying the former partner.
Day responded by accusing Guo of withholding expensive belongings to pressure her into signing an NDA.
Guo “stole hundreds of thousands worth of belongings to coerce me into signing an NDA with hush money,” Day wrote, according to a screenshot included in the filing and reported by The Standard.
“I refused. Because everyone should know how dangerous Lucy Guo is. You continue your narrative. But everyone knows the truth.”
Day also alleged that Guo barred emergency responders from entering her home because drugs were present while someone was said to be dying.
Guo described the post as “replete with falsehoods” and said her planned lawsuit would focus on the emergency-services allegation, which she called the “most offensive statement” and “entirely false.”
“I never refused to let emergency services into my house to help anyone, let alone when someone was dying,” she said.
Day has about 425,000 followers on Instagram. Guo wants Meta, which owns Instagram, to disclose both women’s follower counts before and after the post, along with data on likes, reposts and viewers of the story.
The California Post reached out to Guo, Day’s attorney’s and Meta, but did not immediately hear back.
Guo submitted the application ex-parte, which could lead to a judge authorizing the request without hearing from Day’s lawyers.
Goldman questioned that approach because the filings show the women’s legal teams were already discussing the dispute.
He said Day’s attorneys could be “blindsided” and miss an opportunity to challenge the scope of the request before a judge rules.
Guo’s attorneys at Los Angeles firm Kinsella Holley Iser Kump Steinsapir described their requests as “narrowly tailored” in the filings, according to The Standard.
Her British solicitor, Paul Tweed, said his firm sent Day a letter outlining Guo’s claim on May 22. Day’s lawyers at Mishcon de Reya replied June 22, and seven letters have since been exchanged, the outlet reported, citing court records.
Day’s lawyers dispute that England is the appropriate place for the case and say she has no fixed residency, according to Tweed’s declaration.
Guo cofounded Scale AI with Alexandr Wang in 2016. She left two years later but retained a stake that accounts for most of her wealth.
She now runs Passes, a creator subscription platform, and performs as a DJ.
Her parties have also attracted attention. The Miami New Times reported that a 2022 gathering at her Miami condo featured about 120 guests, a lemur and a giant snake, prompting a cease-and-desist letter from her HOA.
“You can be a CEO and an investor and DJ until 2 a.m.,” Guo told Out magazine. “You can care deeply about your work and still have a huge, weird, fun life outside of it.”
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