Paul McCartney has fueled rumors he is set to wed American heiress Nancy Shevell after allegedly seeking out their families' approval of their union.

The couple sparked reports they were set to walk down the aisle in April after McCartney was spotted shopping at top London jewellers S.J. Phillips for an apparent engagement ring. And the pair have reportedly sought the blessing of their families, reports Britain's News of the World newspaper.

A source tells the publication, "Paul's utterly enchanted with Nancy and he's already rolling the idea of marriage around in his head. He adores everything about her. He thinks she's 'The One' and told (his daughter) Stella as much. He said, 'What would you say if I asked Nancy to be the next Mrs McCartney?' And she joked back, 'At least she's financially independent.' The whole family thinks Nancy's great - a vast improvement on Paul's last love interest."

Earlier this month the pair embarked on a road trip across America - and are said to have journeyed 1,000 miles from New York to Springfield, Illinois.

The source adds: "They've been with each other 24/7 - a perfect way to see if they're suitable for marriage. Paul's not about to rush into anything, but he's happier than he's been for years. They've got so much in common. He knows Heather was a mistake, although he loves their little one (daughter) Bea more than anything, and won't be put off by a bad divorce experience."

Meanwhile Shevell, 47, is reportedly rushing to finalise her own divorce to U.S. lawyer Bruce Blakeman.

The source continues, "Nancy and Bruce have been separated a long time but her relationship with Paul has spurred them on to finally dissolve the marriage. They've moved on with their lives and Bruce approves of Paul. It's all amicable."

McCartney and his second wife, Heather Mills, were divorced last year, resulting in a $46 million settlement being paid to Mills.

(This news article provided by World Entertainment News Network)