By Emily Smith /

  • Swedish-born former model and socialite Charlotte Bonstrom left her restaurateur husband, Vittorio Assaf.
  • She intends to marry her sister’s husband – Zadig & Voltaire founder Thierry Gillier.
  • Her sister, Cecelia Bonstrom, shared cryptic Instagram posts about the alleged affair last year.

It’s a family affair!

The Swedish-born wife of a celebrity New York restaurateur is dumping him — for her twin sister’s husband, Page Six has learned.

Former model Charlotte Bonstrom has been married to Italian-born Vittorio Assaf, the co-founder of Serafina Restaurants, for more than 20 years and has two children with him.

But during the pandemic, Charlotte is said to have struck up an affair with Frenchman Thierry Gillier, founder of the fashion house Zadig & Voltaire — despite him having been married to her identical twin, Cecilia Bonstrom.

“Charlotte had an affair with Thierry and it broke Celia’s heart…,” one source said. “Poor Cecilia, betrayed by her husband and her twin sister.”

Now, New York society is buzzing about another potential sister act, with talk that jilted Cecilia has taken up with Assaf in revenge.

Assaf, 62, denied rumors of a high-society partner swap, though he confirmed that his wife was keen on tying the knot with her sister’s hubby.

“Charlotte and I are in the process of getting divorced – she wants to get remarried,” he told Page Six on Wednesday. “[She] is getting married to Thierry Gillier, the ex-husband of her sister.”

“It is very difficult,” Assaf added, “but I have nothing to do with the sister of Charlotte.”

The source alleged that Charlotte began straying because she was “hurt” that Assaf “often spent time with models during their marriage.”

“She was very hurt, but learned to accept it and then she started secretly dating other people,” the insider said.

It is believed that Cecilia, also an ex-model, found out about the affair around March 2020 — when she appeared to post about it on Instagram.

“You’re looking for three things generally, in a person: Intelligence, energy and integrity. And if they don’t have the last one, don’t even bother with the first two,” she wrote, tagging both her hubby and sister in the caption.

Days later she posted a picture of her red tearful eyes and wrote, “#momentoftruth#iknowwhoiam#nolies.” Then, a post saying, “Maturity is learning to walk away from people & situations that threaten your peace of mind, self-respect, values, morals or self-worth.”

Cecilia remains creative director of 62-year-old Gillier’s prestigious fashion label — “even though her husband is with her sister,” as another source put it, adding, “I don’t know how that is going to work out.”

“My God, what drama,” the insider said. “One would think there would be other men around than your twin sister’s husband.”

The source also said it’s unlikely that the 50-year-old twins will ever be friends again.

“Its such a crazy story — you just couldn’t even make it up.”

When reached by phone Wednesday, Charlotte Bonstrom declined comment, saying, “This is my private life. You can write whatever you want. I have two children in the middle, and I care about them more than the New York Post.”

Her sister did not respond to requests for comments. Reps for Zadig & Voltaire did not get back to us.




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