At one point the actress lifted up her grey jumper to reveal her midriff

The 27-year-old was shooting scenes for Knight of Cups alongside her co-star Christian Bale.
As she played in the shallow water, Isabel was seen lifting up her knitted grey jumper.
She was also sporting a sheer maroon maxi skirt which she hitched up as she took to the sea.
The garment added an ethereal touch to the outfit and The Pacific star’s incredibly slender legs were on show as she gallivanted around.

Rail thin: Isabel also revealed her rib cage while doing a cartwheel on the grass

Tiny tummy: At one point the actress lifted up her grey jumper to reveal her midriff

Meanwhile Christian looked suave in a black suit but went barefoot to stick his toes in the sand.
The pair were joined by Wes Bentley and a female actress who will also appear in the highly-anticipated Terrence Malick film, due for release next year.
While Isabel may have taken her weight loss regime too far, the starlet seemed in good spirits while on location today.