Gwen Stefani showcased her toned physique as she hit the beach in the Caribbean on Monday.

The No Doubt star's six-pack was enough to rival husband Gavin Rossdale's as the couple strolled side-by-side along the sands in St Barts.

The pair travelled to the private hideaway with their two children – Kingston, 3, and 15-month-old Zuma - after spending Christmas in London.

Gwen Stefani looked in toned shape as she hit the beach with her family.

And the family made the most of the sun yesterday as they constructed sandcastles together.

Gwen and Gavin, who have been married for almost eight years, were later spotted treating Kingston and Zuma to a picnic feast.

Gwen Stefani shows off her muscles