#Brad Pitt’s girlfriend reportedly is married but in an ‘open’ relationship

Brad Pitt’s girlfriend is a fan of open relationships — she apparently has one with her husband, a report says.

Pitt gal pal Nicole Poturalski, 27, has been married to well-known German restaurateur Roland Mary, 68, for eight years, and the couple have a 7-year-old son, the Daily Mail said.

But Mary, who owns the trendy Borchardt restaurant in Berlin and is reportedly on his fourth marriage, doesn’t mind his much-younger wife dating the hunky Hollywood superstar, a friend told the Mail.

“They are still married, but you could describe their relationship as an ‘open marriage,’ ” the pal said of Poturalski and Mary.

“He has been married several times and has five children,’’ the source said of Mary. “He is not interested in negativity or jealousy.”

It appears that Poturalski, whose relationship with Pitt, 56, was confirmed by Page Six last week, may have even met the “Once Upon a Time in Hollywood’’ star at her husband’s restaurant last summer.

Pitt was there promoting the flick at the time, the Mail said.

The Polish-born model then flew to Los Angeles a few weeks later, and she and Pitt began hooking up, including for a Kanye West concert in November, according to Page Six and the outlet.

Pitt’s hot romance comes as his court battle with ex Angelina Jolie is heating up, too.

Jolie is trying to get the judge tossed from their divorce case, claiming the jurist hasn’t been forthright enough about previous dealings with one of Pitt’s lawyers. Pitt’s lawyers noted in responding court papers that the judge is the one who Jolie picked to marry them in 2014.

A rep for Pitt declined comment on Poturalski. Neither the model nor her husband could immediately be reached for comment.