Rosie O'Donnell and Tatum O'Neal Are 'Romantically Involved': Source

In an unexpected summer romance, Tatum O’Neal and Rosie O’Donnell are dating, a source tells PEOPLE.

“They are romantically involved,” says the source. “It’s a bicoastal relationship.”

News of the under-the-radar relationship comes just months after O’Neal, 51, revealed exclusively to PEOPLE that she now dates women.

Rosie O'Donnell's Daughter Chelsea Always Wanted to Leave Home 'as Soon as She Turned 18,' Says Source

As Rosie O’Donnell’s daughter Chelsea leaves the star’s home to move in with her biological mother, a source tells PEOPLE the teen had been wanting to move out for a while.

“Chelsea made a decision when she turned 18 that she wanted to go to her birth mother,” the source says. “This was her choice.”

Chelsea turned 18 Monday, and a rep for O’Donnell confirmed to PEOPLE on Wednesday that she chose to relocate to Wisconsin and live with her birth mom Deanna Micoley. The comedian adopted Chelsea in 1997.

Steven Sheerer Accused of Sending a Nude Photo to Rosie O'Donnell's Daughter

Steven Sheerer, the man who allegedly housed the 17-year-old daughter of Rosie O’Donnell, appeared in court on Monday on charges of endangering the welfare of a child and sending the girl a nude photograph.

Rosie O'Donnell's Father Edward Joseph O'Donnell Has Died

Rosie O’Donnell’s father, Edward Joseph O’Donnell, has died of cancer, PEOPLE has learned. He was 81.

The actress’s father immigrated to the U.S. from Ireland, and worked as an electrical engineer in Comack, Long Island, during her youth. He worked as an aerospace electrical engineer for Fairchild, Schlumberger and Grumman. O’Donnell had five children.

Alleged Heroin Addict Charged After Being Found with Rosie O'Donnell's Missing Daughter

The man who allegedly housed Rosie O’Donnell’s 17-year-old daughter Chelsea for a week while she was missing from home has been charged with child endangerment and communication of obscenity, New Jersey prosecutors announced Saturday.

Rosie O'Donnell Responds to Question About Daughter's Disappearance: 'No Mom Is Perfect'

Just one day after her teen daughter Chelsea was found in the home of an alleged heroin addict, Rosie O’Donnell responded to a commenter on Twitter who asked how the incident could have happened.

“BUT @ Rosie IS A Perfect Mom,” Lisa Maracso Tweeted. “How can this be?”

“No mom is perfect – we all do our best,” O’Donnell replied.

More Details Emerge About Steven Sheerer, the Alleged Heroin User Who Housed Rosie O'Donnell's Daughter Chelsea for a Week

Rosie O'Donnell Is 'Very Concerned' About Daughter Chelsea After She Was Found with Alleged Heroin Addict, Source Says

One day after Rosie O’Donnell’s daughter Chelsea, 17, was found by police after having gone missing, disturbing new details are emerging.

The teen, who O’Donnell revealed suffers from mental illness and had gone off her medication, was missing for an entire week, a source tells PEOPLE, and was found in the home of an alleged heroin addict in New Jersey.

Rosie O'Donnell's Daughter Found Safe: Chelsea, 17, Recovered After Frantic Search

Rosie O’Donnell’s 17-year-old daughter Chelsea has been found safe several hours after she was reported missing in New York.

“Rosie wants to thank everyone for their help, especially the South Nyack, New York, and Barneget Light, New Jersey, police departments. Her daughter Chelsea O’Donnell has been located by the police and is safe in their custody,” her rep told PEOPLE.

From Rosie O'Donnell to Star Jones: The View's Most Dramatic Exits

On Thursday, Conservative commentator Nicolle Wallace announced she was leaving The View after one year. Although the news came as a shock to viewers, the political buff isn’t the first to make such an announcement on the daytime talk show.