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Luann de Lesseps is kicking herself over giving up her beloved countess title — for the sake of seven months of bad marriage to businessman Tom D’Agostino.

“Poor Luann. She loved being a countess,” said a source.

De Lesseps has used the title since she married French Count Alexandre de Lesseps in 1993 (and even introduced herself as “the countess” to limo drivers and other staff).

She continued to go by it after their divorce in 2009, but had to give it up when she married D’Agostino on New Year’s Eve last year.

Before the wedding, she said on Bravo’s “The Real Housewives of New York City” that “the only title I’d give up ‘countess’ for is ‘wife.’ ” It turned out to be a very bad trade.

Page Six exclusively reported last week that the couple had filed for divorce after seven months.

On Tuesday, she told us, “I was married to my first [husband] for a long time and had two children with him. The countess will always be a part of who I am.” De Lesseps still uses the title for business: She has clothing and bedding lines called “the Countess Collection.”

Interestingly, Luann chose Switzerland — where she used to live with the count during her first marriage — as her getaway following her split with D’Agostino. Perhaps she’s trying to rediscover her countess core?