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Lucky number 21.

Danielle Staub is set to get married on Monday to businessman and Duke of Provence Oliver Maier after just weeks of dating, making her a Duchess just like Meghan Markle and Kate Middleton.

The “Real Housewives of New Jersey” star and her new man are set to fly back from St. Barts to purchase their engagement rings on Friday, an insider said, noting that they do not want to have a long engagement. She only jetted off to the island to meet up with him on Sunday.

They are planning on tying the knot in a justice of the peace ceremony on Monday. “RHONJ” co-star Teresa Giudice will serve as their witness.

This is Staub’s 21st engagement.

Staub, 56, just finalized her divorce from Marty Caffrey last week. They were married for just nine months after two years of dating.

After the wedding, the couple is planning on splitting their time between New York where Maier resides and Paris.

Staub’s rep confirmed the quickie wedding.