Paul McCartney and his girlfriend of four years, Nancy Shevell, are engaged to be married, sources tell PEOPLE.
"Nancy and Paul are getting married," a source close to Shevell, 51, a New York businesswoman, tells PEOPLE. "Ring and all ? very exciting."
The Beatles legend, 68, started dating Shevell in the Hamptons during the summer of 2007, and despite their 17-year age difference, a source close to the couple told PEOPLE they were a perfect pair.
"They have the right chemistry," the source said. "They're both cool, chilled out and optimistic."
The couple most recently stepped out on Monday for a gala at the Metropolitan Museum of Art in New York City.
This will be McCartney's third marriage: He married Linda McCartney in 1969 and Heather Mills in 2002. While his marriage with Mills ended in a messy divorce in 2008, McCartney didn't seem hesitant to give love another shot.
"I just like being in love," he said of his budding romance with Shevell in 2008.
His fiancée even won over the kids ? McCartney has five children: Heather, 48, Mary, 41, Stella, 39, James, 33, and Beatrice, 7 ? and, in 2009, a source close to Stella said the fashion designer was "thrilled for her father."
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