Christie Brinkley spent the Fourth of July “blowing off some steam” at ex Billy Joel’s Sag Harbor, N.Y., house, a source tells PEOPLE.

Brinkley, whose ugly divorce from Peter Cook has been heating up in court, arrived with daughter Alexa Joel, 20, and “seemed good,” says a friend of the supermodel’s. “She was just blowing off some steam, being with family. It was just a relaxing little get-together. Nothing special. Just what everyone does on the Fourth.”

Another onlooker says Brinkley, Alexa, Billy and about a dozen friends “were having a blast,” eating barbecue ribs and corn and sipping white wine.

At one point Alexa dropped her first plate of food “they were all laughing about that,” says the source.

As for Brinkley, “she was hugging the kids there, they were all laughing and eating. They seemed really relaxed.”

The day before, Brinkley also surrounded herself with family and friends, enjoying a midday lunch with her son Jack, 13, and a girlfriend at Gosman’s Dock in Montauk, N.Y.

“Christie looked beautiful in a white floral sundress, but she wasn’t exactly upbeat,” says a fellow diner. “Maybe just a little tired but she seemed relaxed kind of just getting away from it all and having a nice lunch.”

“She seemed OK, said hi to a few friends,” says the source. “She was very pleasant calm and casual.”

Meanwhile, Cook spent the holiday with his 13-year-old son Jack and girlfriend Suzanne Shaw. After picking up Jack from Brinkley’s house, the trio went for a ride on Cook’s boat, The Sweet Freedom.

“He seemed fine, relaxed,” says an onlooker at Island Surf shop in Sag Harbor, where Cook stopped in with Jack to pick up T-shirts and “stuff for camp.” Adds the source: “He’s always in here with his son. He’s a good guy and a great dad.”

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The “Entourage” actor and the pint-size “Blade” star were both at the “Public Enemies” wrap party at Bon V lounge in Chicago the other night. “They had a bit of a tiff,” said our spy. “Dorff was p - - - ed because it was ‘his’ wrap party and he thought Piven crashed it.” Dorff has a role in “Public Enemies” and Piven was in Chicago, his hometown, for a fund-raiser. In 2006, we reported the two had a screaming match at Bungalow 8 after Dorff cut in front of Piven in the bathroom line and Piven called him a “has-been.” Piven’s rep confirmed they were both at the party, but said they “did not interact.”

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To children of the ’70s, she was a glamorous TV icon with her bullet-proof bracelets and Star-Spangled corset.

But now Wonder Woman Lynda Carter has turned the “Lasso of Truth” on herself, admitting publicly that she’s an alcoholic.

“I was so good at hiding it too,” the 56-year-old mother-of-two tells TV’s The Insider. “Brilliant.”

But, she says, she could not keep the secret from her family: Her attorney husband Robert Altman and their two children, Jamie, 20, and Jessica, 17.

“My husband asked me … ‘Can’t you just stop this for the children and for me?’ ”

His plea prompted her to seek treatment at a rehab facility near her home in Washington, D.C. “I needed help I begged God in heaven to help me figure this out,” says Carter, now sober for nearly ten years.

What has the recovery process taught her? The best measure of a human being, she says, is “how we treat the people who love us, and the people that we love.”

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Soul diva Amy Winehouse sipped from a glass of red wine and looked a bit unsteady on her feet as she appeared in front of a large audience at the Rock in Rio music festival southeast of Madrid on Friday.

Then, as tens of thousands cheered, she threw off a pair of high stiletto heels in favor of white moccasins, donned a white electric guitar and settled into an intense rendition of some of her best known songs, including “Rehab.”

Winehouse delivered a strong vocal performance accompanied by her octet plus two male backing vocalists.

There was no hint of the controversy that saw the Grammy-winning singer scuffle with a fan at the Glastonbury festival in Britain and show up an hour late looking the worse for wear last May in Portugal.

The singer won five Grammy Awards, including best record, best song and best new artist, in early February, but her musical success has been overshadowed by her tumultuous private life and public struggles with drugs and alcohol.

Last month, her father said she developed emphysema from smoking cigarettes and crack cocaine, although her spokeswoman has said Winehouse only has pre-emphysema symptoms.

Once finished at Rock in Rio, she did not stay for an encore and left the outdoor concert venue by helicopter.

Winehouse’s manager, Michael Jobson, told national broadcaster RTVE that the singer had looked forward to singing in Madrid after appearances in Portugal and Hyde Park, London.

English band Jamiroquai followed Winehouse on stage, with Colombian pop singer Shakira topping the bill.

The Police, Bob Dylan, Lenny Kravitz, Alejandro Sanz and Franz Ferdinand were all due to perform over the weekend.

Organizers said around 350,000 people were expected to have enjoyed music at the newly inaugurated concert site by the end of the festival.