Former child star Michelle Trachtenberg has died at age 39.

The Post broke the news on Wednesday, Feb. 26. Trachtenberg’s rep, Gary Mantoosh, told The Post, “It is with great sadness [we] confirm that Michelle Trachtenberg has passed away. The family requests privacy for their loss. There are no further details at this time.”

According to sources, the “Gossip Girl” star underwent a liver transplant shortly before her death.

Her cause of death has not been made clear, but insiders said it’s not being investigated as suspicious.

Trachtenberg had numerous memorable roles over the years, including in “Harriet the Spy,” “Buffy the Vampire Slayer,” “Gossip Girl” and “Ice Princess.” 

Her mother, Lana Trachtenberg, found Michelle Wednesday around 8 a.m. in her New York City apartment. 

Before her death, the actress sparked health concerns when her Instagram followers noticed her troubling appearance. 

In recent months, she appeared gaunt in photos, which caused some of her 800,000 Instagram followers to speculate about her health or whether she had gotten plastic surgery. 

Last January, Trachtenberg responded to fan concerns saying she was “happy and healthy” and had never had plastic surgery.

That month, she posted a selfie. “Snake it to make it,” she wrote in the caption. 

“Concerned for yellow in your eyes but other than that you are a QUEEN and you’re a wonderful human being who deserves love and joy,” one commenter wrote. 

Yellow eyes can be a symptom of liver problems. 

Another fan accused her of getting plastic surgery: “You’re stunning, but you had buccal fat removal. Your cheeks suddenly look sucked in, exactly the same way the buccal fat removal in the face/cheeks does to people. You’ve always been beautiful and still are and there’s nothing wrong with getting surgery, but why lie about it?”

In January 2024, Trachtenberg clapped back in an Instagram post. 

“Fun fact. This is my face,” she wrote in a caption alongside a selfie. 

“Not malnutrition no problems. Why do you have to hate? Get a calendar,” she wrote.

In a 2021 interview with “Entertainment Tonight,” Trachtenberg opened up about her career — and leading role in 1996’s “Harriet the Spy.”

“I turned 10 years old on the first day of principal photography of ‘Harriet the Spy.’ Rosie [O’Donnell] was my biggest supporter,” she said about her co-star at the time. 

“There was a lot required of me. I’m extremely grateful for the experience.”

She added: “When I do look at social media, which is challenging, [I see] them coming in with, ‘You inspired my life. You made me become a writer.’ All of those, just beautiful things.”

Years later, she’d go on to star in “Buffy the Vampire Slayer” from 2000 to 2003 — and regret not taking props home with her.

“Actually, I was texting with Sarah [Michelle Gellar] the other day. And I was like, ‘Oh, man. I should have taken a whole bunch of stuff,'” she added to the outlet. “She was like, ‘You don’t leave your house.’”

Trachtenberg also noted that her favorite role was “Gossip Girl,” because her character, Georgina Sparks, was “such an evil B-I-T-C-H.”

She quipped: “That was fun.”

In a statement to The Post about her death, Trachtenberg’s “Buffy” co-star James Marsters, who played Spike, said on Wednesday, “We have lost a beautiful soul. Michelle was fiercely intelligent, howlingly funny, and a very talented person.”

He added: “She died much too young, and leaves behind scores of people who knew and loved her.”