Nancy Shevell, 58, plays energetic ball game on the beach

Her husband is 17 years her senior - but Sir Paul McCartney, 75, had no trouble keeping up with wife Nancy Shevell, 58, on Thursday on the beach in St Barts.

Seen embarking on a spirited game of American football with his grandchildren, lithe and energetic Nancy looked half her age as she was seen sprinting up and down the sands and even making tackles against her 25-year-old son Arlen Blakeman.

The 58-year-old couldn't be missed in a sunshine yellow kaftan, under which she flashed her patterned swimsuit as she moved at pace with bare feet. 

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Games: Nancy Shevell was seen throwing an American football as she larked about on the beach in St Barts on Thursday with husband Sir Paul McCartney and his grandchildren

Games: Nancy Shevell was seen throwing an American football as she larked about on the beach in St Barts on Thursday with husband Sir Paul McCartney and his grandchildren

Showing her natural athleticism, Nancy flashed her lithe legs in a lacy black swimsuit paired with a tropical yellow cover-up as she raced along the beach.

Her brunette tresses were styled sleek and straight and she accessorised with chic dark shades.

Nancy was seen tackling Arlen, her only son, keenly displaying her competitive side as she tried to keep a hold of the ball.

Toned: The star showed off her toned legs as she frolicked on the beach 

Fun in the sun: The Beatles legend, 75, was joined by wife Nancy, 58, (L) and daughter Stella, 46, who looked perfectly stylish

Toned: Paul looked lithe as he lightly jogged along the white sands in the sunshine

Toned: Paul looked lithe as he lightly jogged along the white sands in the sunshine

Refreshing: Paul appeared to roar as he held his arms up in the air as a wave splashed him

Refreshing: Paul appeared to roar as he held his arms up in the air as a wave splashed him

Winner, winner: Nancy was seen almost taking down her son Arlen Blakeman, as he attempted to tackle her

Winner, winner: Nancy was seen almost taking down her son Arlen Blakeman, as he attempted to tackle her

Afterwards, Sir Paul was seen capturing a picture of his wife with the ball in hand, hinting that she was ultimately victorious.

While Paul is step-father to Arlen, Nancy also has a close relationship with the Beatles star's grandchildren, some of whom are holidaying with the group.

Paul's daughter Stella, along with her children Miller, 12, Bailey, 11, Beckett, nine and Reiley Willis, were also seen on the beach.

Paul and Nancy tied the knot on October 9, 2011, exchanging vows at London's Old Marylebone Town Hall register office.

Watch out! Arlen, who is Paul's step-son, resembled his mother with lithe, athletic limbs

Watch out! Arlen, who is Paul's step-son, resembled his mother with lithe, athletic limbs

You're not getting away that easily! Nancy was hands-on in her approach, definitely meaning business

Mumma knows best: Arlen Blakeman is Nancy's son from her previous relationship

Mumma knows best: Arlen Blakeman is Nancy's son from her previous relationship

Glamorous Nancy is an heiress to a haulage fortune and is Sir Paul's third wife after Linda McCartney died in 1998.

He divorced second wife Heather Mills ten-years later, in 2008.

Sir Paul and Nancy arrived in St Barts on Boxing Day with Stella's sons, four months after St Barts was rocked by devastating Hurricane Irma.

Earlier this year, the island's Eden Rock Hotel & Villas - a luxury resort owned by the parents of Made in Chelsea star Spencer Matthews and his brother, Pippa Middleton's husband James - was damaged in the natural disaster. 

Beach fun: Nancy looked playful as she chased Paul's grandson Miller along the beach during a game

Beach fun: Nancy looked playful as she chased Paul's grandson Miller along the beach during a game

Games: There was clearly a competitive spirit during the family beach day as the game got underway

Games: There was clearly a competitive spirit during the family beach day as the game got underway

Banter: Nancy tackled her teammate during the fun-filled game on the beach with Paul's grandson

Banter: Nancy tackled her teammate during the fun-filled game on the beach with Paul's grandson

Jennifer Connelly and her husband Paul Bettany, Ashley Oslen, Olivia Palermo, Jake Gyllenhaal and Chrissy Teigen all visited St Barts last year but seem to have decamped to other destinations in 2017.  

Paul is currently enjoying his annual beach break with his wife Nancy, his daughters and his grandchildren. 

The rocker certainly wasn't kicking back when he was seen taking an energetic sprint into the sea with stylish daughters Stella, 46, and Mary, 48.

The Beatles legend looked over the moon as he enjoyed a refreshing dip in the sea before larking around with Stella and Mary on the beach.  

Splashing around: Nancy later cooled off in the sea with Stella's daughter Reiley Willis

Victory is sweet: The brunette held up the ball for a picture captured by Sir Paul afterwards

Victory is sweet: The brunette

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