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Paul McCartney is lovin' the good life in St. Barths!

With his arm around his 51-year-old fiancee Nancy Shevell, the 68-year-old Beatles legend rocked colorful board shorts and a baseball cap while cruising in the sand.

McCartney met his future wife back in 2007, and five years later, seems like the sparks are still flying!

Shevell also happens to be Barbara Walters' cousin! See more of Paul and Nancy enjoying paradise together in our gallery below.