Some Hollywood actresses have used their fame to share ideas that go far beyond their movie roles. Over the years, a number of well-known stars have promoted conspiracy theories on social media, in interviews, and at public events.
These claims have sparked serious debates about the responsibility that comes with having a large platform. From anti-vaccine movements to QAnon support, the impact of celebrity misinformation is hard to ignore.
1. Roseanne Barr
Few celebrity meltdowns have been as public or as career-ending as Roseanne Barr’s social media spiral. The comedian and actress became one of Hollywood’s loudest voices for the QAnon movement, regularly posting about deep state plots and shadowy global elites.
Her tweets grew so controversial that ABC fired her from the revival of her own show, “Roseanne,” in 2018. Even after losing the role, she kept sharing fringe theories online, doubling down rather than stepping back.
2. Jenny McCarthy
Jenny McCarthy turned her celebrity status into a megaphone for one of the most damaging health conspiracy theories of the modern era. She claimed that routine childhood vaccines caused her son to develop autism, a claim that scientists have repeatedly and thoroughly debunked.
Her vocal activism helped fuel a wave of vaccine hesitancy across the United States during the late 2000s. Pediatricians and public health officials spent years working to undo the fear her platform helped create.
3. Letitia Wright
Best known for her powerful role in “Black Panther,” Letitia Wright sparked a firestorm when she shared a video questioning the safety of COVID-19 vaccines. The clip also included transphobic comments and climate change denial, making the backlash even more intense.
Reports from the set of “Black Panther: Wakanda Forever” suggested she continued promoting these views during filming. She eventually deleted her social media accounts, but the damage to her public image had already been done.
4. Evangeline Lilly
When the pandemic hit, most public figures urged people to stay home. Evangeline Lilly did the opposite.
The “Ant-Man and the Wasp” star openly refused to self-isolate and suggested the government was using the virus as an excuse to grab political power.
She later apologized for her tone, but then showed up at anti-vaccine mandate rallies in Washington D.C., signaling that her views had not changed much. Her actions drew fierce criticism from fans and health professionals alike.
5. Kristy Swanson
Kristy Swanson, the original film Buffy the Vampire Slayer, traded slaying vampires for spreading QAnon talking points on Twitter. She regularly posted about secret cabals of pedophiles and claimed Donald Trump was waging a hidden war to expose them.
Swanson also questioned the seriousness of the pandemic and the reliability of COVID vaccines. She remains an active and unapologetic voice in fringe political circles, frequently engaging with followers about what she calls hidden truths.
6. Minnie Driver
Minnie Driver raised eyebrows when she shared posts on social media that questioned the official narrative around several global events. While she has not aligned herself with a specific conspiracy movement, her willingness to amplify fringe content drew criticism from followers.
Supporters argued she was simply asking questions, while critics pointed out that sharing unverified claims to millions of followers carries real consequences. The episode opened a wider conversation about celebrity responsibility in the age of social media misinformation.
7. Alyssa Milano
Alyssa Milano has long been a vocal activist, but some of her online claims have crossed into disputed territory. She faced criticism for sharing posts that contained inaccurate or misleading information about political events and public figures.
While many of her causes are widely supported, the habit of spreading unverified content on a platform with millions of followers has landed her in hot water more than once. Critics argue that good intentions do not cancel out the harm of misinformation, no matter who is sharing it.
8. Jenna Jameson
Jenna Jameson became a surprisingly enthusiastic promoter of QAnon content after converting to a more conservative worldview. She posted extensively about deep state plots, child trafficking rings run by elites, and secret government operations that mainstream media allegedly ignored.
Her account was eventually flagged and restricted on multiple platforms due to the nature of the content she shared. The transformation from entertainment icon to fringe theory promoter shocked many of her long-time fans and followers.
9. Marjorie Taylor Greene (actress-turned-politician)
Before entering politics, Marjorie Taylor Greene appeared in various media projects and built a public persona that eventually led her to Congress. Along the way, she promoted a staggering range of conspiracy theories, including claims about school shootings being staged and Jewish space lasers causing wildfires.
Her QAnon affiliations were well-documented before her election, and she has never fully distanced herself from those beliefs. Her rise to power made her one of the most controversial figures in recent American political history.
10. Kirstie Alley
Kirstie Alley was beloved for her comedic roles in “Cheers” and “Look Who’s Talking,” but her later years were marked by increasingly controversial social media activity. She supported Donald Trump’s claims of widespread election fraud in 2020 and shared content that echoed QAnon narratives.
Alley was also skeptical of COVID-19 health measures and frequently clashed with followers who pushed back on her views. She passed away in 2022, leaving behind a complicated legacy shaped partly by her outspoken online presence.
11. Sherri Shepherd
Sherri Shepherd is best known as a co-host of “The View,” where she made headlines for saying she was unsure whether the Earth was flat. While she later clarified the comment, it sparked a lengthy public debate about what celebrities say on live television.
Her willingness to entertain scientifically unsupported ideas on a show watched by millions highlighted the tricky balance between casual conversation and responsible broadcasting. The flat Earth moment became one of the most replayed clips from the show’s long history.
12. Tara Reid
Tara Reid has never been shy about sharing unconventional opinions, and over the years some of those opinions have veered into conspiracy territory. She has made claims about the entertainment industry that many dismissed as unfounded, and her social media posts have occasionally sparked confusion and concern.
While she may not be the most prominent name on this list, her willingness to voice fringe ideas to her fan base is a reminder that celebrity misinformation comes in many forms and from many corners of Hollywood.
13. Ricki Lake
Ricki Lake produced and appeared in “The Business of Being Born,” a documentary that challenged mainstream medical practices around childbirth. While the film raised legitimate questions, it also helped amplify anti-establishment health narratives that critics said discouraged women from seeking proper medical care.
Lake has also spoken out against certain vaccines and conventional medicine more broadly. Her platform gave credibility to ideas that medical professionals warn can be genuinely dangerous when taken too far by vulnerable audiences seeking alternatives to standard care.
14. Mayim Bialik
Mayim Bialik has a real PhD in neuroscience, which made it all the more surprising when she promoted practices that mainstream medicine does not support, including vaccine skepticism and attachment parenting choices that raised eyebrows among pediatricians.
She wrote a book that included claims about natural remedies over conventional treatments, drawing criticism from the scientific community. The irony of a trained scientist lending credibility to fringe health ideas was not lost on observers, and the backlash pushed her to revisit some of her public statements.
15. Jessica Biel
Jessica Biel made headlines in 2019 when she was photographed lobbying California lawmakers alongside a known anti-vaccine activist. She claimed she was not anti-vaccine but simply opposed a bill that would make it harder to get medical exemptions from school vaccination requirements.
Critics were unconvinced, arguing that her actions aligned her with a movement that spreads dangerous misinformation regardless of her stated intentions. The incident was a textbook example of how celebrity involvement can lend undeserved weight to fringe health campaigns.
16. Erin Brockovich
Erin Brockovich built her reputation as a fearless environmental crusader, but some of her later campaigns have been criticized for amplifying health scares that lacked solid scientific backing. She has promoted concerns about chemical exposure and environmental illness that experts say go beyond what the evidence actually supports.
Her credibility from the real-life legal case that inspired a blockbuster film gives her claims extra weight with the public. That makes it especially important, critics argue, to carefully separate legitimate environmental concerns from unfounded fear-based narratives.
17. Rosie O’Donnell
Rosie O’Donnell sparked one of the earliest celebrity conspiracy controversies of the internet age when she publicly questioned the official account of the September 11 attacks. She suggested on “The View” that the collapse of World Trade Center Building 7 could not have been caused by fire alone.
The claim echoed 9/11 truther talking points that engineers and investigators have consistently refuted. The moment remains one of the most memorable examples of a mainstream celebrity giving airtime to a widely debunked conspiracy theory.
18. Gwyneth Paltrow
Gwyneth Paltrow built a wellness empire with her brand Goop, but the company has been repeatedly called out for promoting products and ideas that have no scientific support. From jade eggs to coffee enemas, some Goop recommendations have been flagged by doctors as not just ineffective but potentially harmful.
Paltrow settled a lawsuit over misleading health claims and has been criticized for using her Oscar-winning fame to lend legitimacy to pseudoscience. Her story is a cautionary tale about how celebrity wellness culture can blur the line between lifestyle choices and dangerous misinformation.