For 10 years, MTA board member Nancy Shevell has been going to meetings at the authority's midtown headquarters. But last week, she attended her first meeting as the fiancee of singer Paul McCartney.

She conducted business as usual as the chairwoman of the bus operations committee after she became engaged to the music legend earlier this month.

But the development has certainly sharpened the contrast between between the two sides of Shevell's life: By night, she steps through swarms of paparazzi on the arm of the former Beatles frontman en route to A-list events, and by day, she presides over discussions about the latest additions to the city's articulated bus fleet.

Shevell, vice president of her family's Elizabeth, New Jersey-based trucking company New England Motor freight, was appointed to the MTA board by former New York Governor George Pataki in 2001. She was once referred to by British tabloid The Daily Mail as "the most glamorous trucking executive in the world."

She and her ex-husband Bruce Blakeman, whom she divorced in 2009, were major contributors to the Republican Party. Blakeman, a lawyer who has sat on the Port Authority board, was such an effective fundraiser the party tapped him to run for state controller in 1998, but he lost to Carl McCall. He also ran unsuccessfully in 2010 against U.S. Senator Kirstin Gillibrand.

Shevell's political contributions have also leaned heavily Republican. Her list of favored candidates has included Alfonse D'Amato, Rudy Giuliani and the Republican National Committee. Pataki frequently appointed donors with that kind of track record to posts on public authorities.

Shevell began dating McCartney in 2007, at an event in the Hamptons, where they both have houses.

Since McCartney is a British knight, once the pair is married, rules of etiquette say Shevell will be required to be called Lady McCartney — something her fellow MTA board members might need some time to getting used to.