The 52-year-old actress, who was once rumored to have dated the tech mogul, appeared to make the joke as a dig while referencing her ongoing quest to make a trip to Mars a reality.
This comes as Cameron Diaz returns to the spotlight after a long absence from Hollywood to focus on his personal life.
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Cameron Diaz took a dig at Elon Musk in his conspiracy theory

During a recent promotion for his action comedy with Foxx, Diaz showed off his comedic side, leaving the “Back in Action” star visibly stunned.
According to the Daily MailFoxx had asked Diaz to share her GOAT, or greatest, conspiracy theory of all time, prompting the actress to drop a fairly detailed alien tale featuring her boyfriend, Elon Musk.
“All the stories about aliens are always the same,” Diaz began, before adding that these aliens had “big heads, big eyes, no mouth. Telepathically speaking, long, dexterous fingers.”
She added: “If you think about where we are right now in technology, we’re sitting in front of a screen. We’re not talking to each other. We don’t need to talk.”
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At this point in his story, Diaz mentioned Musk while mockingly referring to him as “president.”
“And we all know we’re leaving the planet because now Elon Musk is our president,” she continued. “When we get to Mars, we’re really going to end up looking like a completely different species.”
In response to the story, Foxx told Diaz that it had “screwed him up,” seemingly expressing how shocked he was by her crazy conspiracy theory.
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The actress made a return to the red carpet after a five-year hiatus

In recent weeks, the duo has appeared together to promote their film, which debuts on Netflix on January 17.
Diaz and Foxx reunited at the film’s premiere in Berlin, marking Diaz’s first red carpet appearance in five years.
The actress last appeared on the red carpet in 2019 alongside Demi Moore and Drew Barrymore when Lucy Liu received a star on the Hollywood Walk of Fame.
For the event, Diaz looked stunning in a unique look consisting of a black top layered with a sheer black blouse and paired with high-waisted jeans. She completed the outfit with a long black coat and classic loafers.
The actress also posed for photos with Foxx, who was dressed in a suit whose edges were covered in a white and black striped pattern.
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Cameron Diaz says Jamie Foxx inspired her to come out of retirement

Before starring in “Back in Action,” Diaz took a break from Hollywood, having retired from the industry over a decade ago.
In a recent interview with Empireshe revealed how her ‘Back in Action’ co-star inspired her to break her hiatus.
“I thought if I was going to come back and do a movie, the only person I would come back and do it with would be this guy,” said Diaz, who co-starred with Foxx in the classic “Annie.”
She added: “Seriously. I had other opportunities along the way and I was always like, ‘No. I’m not doing it, I told you… What? Jamie asked? Jamie? Oh, I can make a movie with Jamie!'”
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The actress is undecided about her new roles

As fans prepare to see Diaz in “Back in Action” in its Netflix debut, the actress remains undecided about joining any new acting projects in the near future.
“I don’t know how I see it. It’s hard to say,” Diaz said Empire. “If I say it, then it becomes this thing. I reserve the right to say no again to the idea of making a film, and I reserve the right to say yes if I decide to.”
She added, “I don’t define anything. I’m just open to whatever makes sense to me and my family at any given time.”
After decades in the Hollywood spotlight, Diaz had taken a break to focus on his family. She shares two children, daughter Raddix and son Cardinal, with her husband Benji Madden.
Cameron Diaz says she depends on ‘therapy’ to maintain marriage to Benji Madden

In an interview with her brother-in-law, Joel Madden, on his “Artist Friendly” podcast, Diaz opened up about her marriage, crediting “therapy” as a key factor in the strength of her nine-year union with Benji Madden.
Diaz said, “This is what we depend on, so you have that commitment to work on it.” She noted that therapy keeps her and Benji from doing “the same thing over and over again.”
According to the Daily MailThe actress added that therapy encourages her and her husband to ask themselves: “Why didn’t it work? How can I make this work? What’s my part? What’s the job of the other person?”
Diaz also highlighted how therapy taught them to be more “self-aware” and “a little more equipped to hopefully get a different outcome.”
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The ‘Charlie’s Angel’ star explained: “[It helps us] either solve something or create a new understanding of a new process together.