Grimes is taking to Elon Musk‘s social media platform to try to get in touch with her ex … publicly revealing one of their kids needs urgent medical help — but, Elon won’t call her back.

The singer-songwriter posted on X Thursday afternoon in a desperate attempt to get the attention of the platform’s executive chairman … asking him to please respond to her to discuss their child’s medical crisis.

Grimes writes, “I am sorry to do this publicly but it is no longer acceptable to ignore this situation. This requires immediate attention. If you don’t want to talk to me can you please designate or hire someone who can so that we can move forward on solving this. This is urgent, Elon.”

When pressed for details, Grimes said she won’t divulge anything else on X … but, added she needs to get in touch with him to save their child from “life long impairment.” She said if she needs to apply public pressure to get a callback, so be it.

Worth noting … Grimes and Musk have three children together, sharing son X Æ A-Xii — who recently made an appearance at the White House — daughter Exa Dark Sideræl  and son Techno Mechanicus. It’s not clear which child Grimes’ post is referring to.

We’ve reached out to Grimes and Elon — who dated on and off from 2018 to 2022 — about this alleged medical crisis … so far, no word back.

Of course, Grimes isn’t the only woman who has recently turned to X to try to get EM’s attention. Just last week, Ashley St. Clair — a frequent Fox News guest — posted on X to ask Elon to call her to discuss their own child … claiming she gave birth five months ago, and Elon’s ghosted her in the aftermath.

Musk publicly questioned the paternity of the child … though he didn’t hash anything out with ASC online. Unclear if he’s reached out in private.

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Lyle Menendez was constantly injured during his early days in jail, his ex-wife says … but, he kept a sense of humor through it all and never spilled on exactly what happened to him.

We spoke with Anna Eriksson — Lyle’s wife from 1996 to 2001 — who tells TMZ she went to visit Lyle quite a bit when he was first incarcerated … and, he was clearly suffering from a series of injuries when she saw him.

Eriksson says she once saw the white of his eye was blood-red … and, another time he couldn’t even walk properly. Anna says she sent Lyle new shoes but later noticed he was wearing some old ones she didn’t recognize — and, she believes the new ones were taken from him by force.

Despite the obvious issues, Anna says Lyle never opened up to her about what he was going through … claiming instead he was injured playing basketball. He never complained, she said, despite living a brutal experience.

On one occasion, Anna remembers the warden at the prison where Lyle was doing time telling her that Lyle needed to come out of his cell to avoid adding more time to his sentence.

When she told Lyle this, he responded by explaining he saw a fellow prisoner’s throat slit one day … and, he didn’t want to leave his cell in the morning after that because he feared for his life.

Anna says the brothers’ phone calls with their therapists and a priest helped the brothers to calm down and care for themselves behind bars. The help allowed the Menendez bros to better deal with their emotions.

As we told you … Erik spoke with Harvey and Mark Geragos on the “2 Angry Men” podcast about the brutal beatings he and Lyle suffered early on in prison. Their treatment has improved over the years, we’re told … and, Richard J. Donovan Correctional Facility in San Diego has been a much less dangerous environment for the brothers.