Billy Baldwin’s 18-year marriage to Chynna Phillips nearly ended in heartbreak when she filed for divorce on Friday — but then had a dramatic change of heart Sunday.

Baldwin, now filming “Gossip Girl” in New York, was shocked when Phillips instructed her lawyers to file in Santa Barbara.

But after an emotional weekend, the singer — who just completed treatment for anxiety following months of stress — told her attorneys to withdraw the bombshell divorce filing yesterday.

A source said, “Chynna has gone under a lot of personal and professional stress. The divorce petition came after a long and emotional buildup. But once it was filed, she realized she didn’t want to lose Billy and asked her lawyers to withdraw it.”

Phillips, who has three kids with Billy (daughters Jameson, 10, and Brooke, 5, and son Vance, 8), is the half-sister of former child actress Mackenzie Phillips, who claimed in a memoir last year that she had a decade-long sexual relationship with their father, John Phillips of the Mamas and the Papas.

Last fall, Chynna, who said she had “personal struggles” with the news, admitted to People magazine: “I felt like all my plates were in the air and at any moment one would come crashing down . . . [I was afraid] I’d lose my footing and collapse into a puddle of tears.” People also described how Phillips was emotionally torn by leaving her children when she went on tour last year. She added, “We all have days when we feel like we’re tripping over ourselves with deadlines, children and husbands.”

Chynna and Baldwin’s manager, Lizzie Grubman, said, “Every married couple has its up and downs, but they are two people who have been together for 18 years and are deeply in love. They will work through their personal issues and they are committed to staying together.”

 

A representative for Chynna Phillips says the 42-year-old singer has entered an undisclosed treatment facility for anxiety.

A statement issued by her publicist, Lizzie Grubman, says Phillips checked herself into the facility “after much thoughtful deliberation.”

Grubman says Phillips is “looking forward to her recovery.” The statement asks that people respect Phillips’ privacy and the privacy of her family.

Phillips, of the pop group Wilson Phillips, is married to actor William Baldwin. The couple have three children.

She is the half-sister of former child actress Mackenzie Phillips, who claimed in a 2009 memoir that she had a decade-long sexual relationship with their father, pop star John Phillips of the Mamas and the Papas.

 

While you’re gossiping at the watercooler about Mackenzie Phillips’ revelation today that she had a 10-year affair with her father, musician John Phillips, you might also be saying, “Could it be true?”

In the new issue of Us Weekly (on newsstands now), Mackenzie’s half-sister Chynna Phillips, 41, says yes, she thinks it is.

Chynna, who is married to Billy Baldwin, tells Us she remembers getting the call from Mackenzie, 49, in 1997 — 11 years after the affair had ended — while she was between flights at LaGuardia Airport in New York City.

“She said, ‘I don’t know why, but I just really felt the need to call you and tell you something that I think you need to know,’” says Chynna. “And she went on to tell me that she had had an incestuous relationship with our dad for about 10 years.”

Chynna was in such shock, she says, that someone “could have dropped a piano on my head and I probably wouldn’t have felt it. But I knew it was true. I mean, who in their right mind would make such a claim if it wasn’t true?”



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