Easy come, easy go – especially in an open marriage.

Brad Pitt’s gorgeous younger girlfriend, Nicole Poturalski, 27, was spotted out this week having the time of her life with her husband, German restaurateur Roland Mary, 68, just a month after spending time with Pitt in France.

Poturalski and Mary, who have a seven-year-old son together, were seen laughing and smoking with friends at Borchardt, the restaurant Mary owns, in pics obtained by the Daily Mail. The two are in an “open marriage” and Mary is reportedly “not interested” in being jealous about her extramarital dalliance with the hunky actor, according to the Daily Mail.

Poturalski, whose relationship with Pitt, 56, was confirmed by Page Six in August, met the “Once Upon a Time in Hollywood’’ star at her husband’s restaurant last summer.

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