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When the brief marriage between Luann de Lesseps and Tom D’Agostino Jr. ignominiously ended this month, the “Real Housewife of New York City” fled to Gstaad, Switzerland, to be with family, sources tell Page Six.

But her escape hit a snag. Upon arriving at JFK, “Luann realized she’d left her USA passport at her ex Tom’s penthouse,” a source said.

She presented her Swiss passport, only to be told that it had expired. (She previously lived in Switzerland with her first husband, French Count Alexandre de Lesseps.) Distraught, Luann headed to Swiss Air’s offices, where “an official told her Swiss citizens can travel back to Switzerland to ‘regulate’ their passports,” a spy said, meaning renew the document.

“He explained that she could fly.”

A spy said the ex-countess told pals “she could have jumped over the counter to kiss him.”

We hear Luann sent for her US passport to be shipped to her in Gstaad.

Now back in the States, she was seen cheekily singing “Hit the Road Jack” in front of 300 people at a wild Hamptons party last weekend.