Linda Evangelista and her billionaire French baby-daddy Francois-Henri Pinault are getting ready for a presumably fiery trial at Manhattan Family Court. The New York Post reports that Evangelista, 46, and the 49-year-old Pinault will be going to trial Thursday to set up a final order of child support for their love child, five-year-old Augustus.

Francois-Henri Pinault is the husband of Salma Hayek. He is due to testify Thursday. Linda Evangelista will take the stand the day after. The Post reports that the trial will in all probability be a financial free-for-all.

Last year, the two sides locked horns over a monthly bill of $46,000 that Linda Evangelista wants Pinault to foot. Items of note include $15,000 to $16,000 a month for armed chauffeurs formerly of New York’s finest and a 24-hour nanny who costs almost $7,000 a month.

Evangelista’s lawyer, William Beslow, argues that Augustus deserves a lifestyle comparable to what Pinault lavishes on Valentina, his four-year-old daughter by wife Salma Hayek. Beslow points out that Pinault spends $50,000 a month just on the taxes, upkeep and loan payments for the $12 million Los Angeles home he’s put in trust for Valentina.

William Beslow then mentions that Pinault’s family is worth an estimated $11.5 billion. Francois-Henri Pinault himself earns $5 million a year as the CEO of the Paris-based luxury conglomerate that owns Gucci and Yves St. Laurent.

But Pinault’s side counters that Linda Evangelista is also jockeying for mother support. A Pinault source said that Evangelista has claimed 80 to 90 percent of the chauffeur cost as her own business expense in past tax returns. Evangelista is herself worth an estimated $8 million, with earnings of $1.8 million around 2010.

The Pinault source further mentions that Lina Evangelista complains that Valentina spends time at her grandparents’ lavish French country estate when “Augie should have his own country house.”

That conflicts with the quiet personality of Francois-Henri Pinault. “Pinault drives himself to work in France, and is a pretty low-key guy. He doesn’t want this — doesn’t want his kid’s business to be dragged into court. But they haven’t budged in any way,” the source said of the $46,000-a-month request from Linda Evangelista.