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Rosie O'Donnell's teenage daughter secretly married a man 12 years older than her over the summer but hid the news from her famous mother, it was revealed on Tuesday.

The TV host only found out that Chelsea O'Donnell was married when she tried to visit her in the hospital over Labor Day weekend, where Chelsea was staying allegedly because of her depression.

According to a report in the Daily Mail, Chelsea, 19, married Nicholas Alliegro, 31, on July 1 at Islip Town Hall on Long Island, New York after eight months of dating. Few knew of the nuptials, including her famous mother.

The exclusive report said Chelsea was hospitalized on Labor Day and Rosie called the hospital to check up on her. However, she was told by hospital staff that they could only release this information to Chelsea's husband. This was news to Rosie who tried to tell the staff member that her daughter wasn't married and this must be a case of mistaken identity.

Both, though, confirmed to the Daily Mail that they are indeed married, the paper said.

"Chelsea really wanted to get married and told Nick she couldn't imagine spending the rest of her life with anyone else," a source said. "He knew that they would get married eventually but Chelsea was dead-set on getting married immediately, so he bought a diamond ring. She has abandonment issues because of her family situation. She feels that everyone leaves her."

Chelsea's past is well-documented. At 17 years old, Chelsea went missing for a week and was later found with a 25-year-old man she had met on the dating app Tinder. At the time, Rosie was using social media to try and help find her daughter. She said at the time that Chelsea suffered from mental illness and was off of her medication. She was found in an attic of a home in New Jersey.

Rosie and Chelsea, though, could never seem to get on the same page and on the day that Chelsea turned 18, she moved in with her birth mother. Shortly after that, she and Rosie reunited.

As for why she never told her family that she got hitched to Nicholas, a plumber by trade, "they were concerned that [Rosie] wouldn't approve," the source said. But, his immediate family was informed in the days after the wedding took place. "They were shocked but they love Chelsea," the source added.

Chelsea has changed her name on Instagram from Chelsea O'Donnell to Chelsea Alliegro.

"Rosie was disappointed but remained calm after hearing the news," the source told the newspaper, adding that Rosie cut her daughter off financially in light of the news.

Last December, Chelsea told DailyMail.com how happy she was in her new relationship with her man.

"We have everything in common. He makes me feel really good and he brings out the best in me," she said. "He's very supportive and sweet, he makes me laugh, and does small things to make me smile. He goes out of his way to do nice things for me."