Few who have seen Shevell photographed in Israel, Antigua and at the Grammy Awards with McCartney know of her other life as an executive at a New Jersey trucking company and board member of the nation's largest mass transit agency.
But her public and behind-the-scene personas have collided more and more since the socialite began seeing McCartney in the Hamptons in late 2007.
Since January 2008, Shevell has missed four full board meetings, more than any voting member, according to MTA meeting minutes reviewed by The Associated Press. She attended one Finance Committee meeting in the past year, and has 26 absences total, according to the agency's records.
Shevell skipped an MTA committee meeting approving a controversial fare hike the day she walked the red carpet in London. Since early 2008, the unpaid appointee has the worst attendance of any voting board member, sometimes missing meetings to travel around the world with McCartney.
"It is significant. The whole point of the board is to be a check and balance on the MTA's staff work. You've got to be physically present to do that," said Gene Russianoff, a New York City transit advocate. If members can't show up for meetings, he said, "they should resign."
But celebrity observers aren't surprised that Shevell's former private life is taking a back seat to the 66-year-old McCartney.
"Who can blame her?" said Peter Castro, deputy managing editor of People magazine. "How many of us would be happy at an MTA meeting versus stepping out onto the red carpet at a Grammy event with a living Beatle?"
Shevell - who didn't return messages seeking comment left at her offices and at the MTA
- is the vice president for administration of New England Motor Freight Inc., an Elizabeth, N.J., trucking company serving the Northeast and owned by her father, Myron P. Shevell. She was married for over 20 years to attorney Bruce Blakeman, a close friend to former Gov. George Pataki, who appointed her to the MTA board. Barbara Walters is her cousin.
But Shevell's public profile barely existed before photographs appeared in late 2007 of her and McCartney in the Hamptons on Long Island, where McCartney long vacationed with his wife Linda, who died from breast cancer in 1998.
"Nobody knew who she was," said Hamptons scene chronicler Steven Gaines, the co-author of "The Love You Make: An Insider's Story of The Beatles." "She's like 25,000 other accomplished women out here in the Hamptons."
Since then, she's become a red-carpet staple, appearing at the March 23 premiere of "The Boat That Rocked" in London, fashion shows by McCartney's daughter Stella, the Grammys and McCartney concerts around the world.
The public has largely embraced the love story, especially McCartney fans disillusioned by the ex-Beatle's bitter breakup from his second wife, Heather Mills, said Castro.
"Any person coming after that is going to get a lot of attention and scrutiny, because it's a soap opera," he said. "They seem to be really in love and just tremendously pleased with each other."
Shevell hasn't given up her work or her unpaid seat on the MTA, the
agency that oversees subways and buses for over 8 million New York City
riders, regional rails to the suburbs, and bridges and tunnels. Pataki
appointed her in 2001 to a term that expires in 2011.