RadarOnline.com confirmed that paramedics responded to her home at 12:40 PM when they discovered her unconscious.
Officials said there was no sign of forced entry at the home and her death appeared to be accidental, according to the New York Times.
Her official cause of death will later be determined by a medical examiner.
Ivana was 73 at the time of her passing, leaving behind her three children shared with the ex-President: Ivanka, Eric, and Donald Trump Jr.
Trump was one of the first to confirm the news of her sudden death, taking to his social media platform Truth Social with a sentimental message about her family life and accomplishments.
"I am very saddened to inform all of those that loved her, of which there were many, that Ivana Trump has passed away at her home in New York City. She was a wonderful, beautiful, and amazing woman, who led a great and inspirational life. Her pride and joy were her three children, Donald Jr., Ivanka, and Eric. She was so proud of them as we were all so proud of her. Rest In Peace, Ivana," he wrote.
Eric also spoke out as he exited his mother's apartment building this afternoon with his wife nearby, telling reporters, "It's been a very sad day."
Meanwhile, Ivanka shared a statement via Twitter alongside a photo from her childhood, revealing she was heartbroken to lose her mother.
"Mom was brilliant, charming, passionate and wickedly funny. She lived life to the fullest — never forgoing an opportunity to laugh and dance," the former first daughter gushed, adding that Ivana will be forever missed.