Welcome to the jungle!

It looks like actress-model Diane Cougar Kruger may have started a catfight on Jan. 10 while on a romantic vacation in Mexico with boyfriend Joshua Jackson (who, for the record, is only two years her junior).

Kruger was wearing We Are Handsome's feline-print Amazon scoop-back swimsuit ($275, available at Barneys Beverly Hills), which was originally spotted Dec. 26 on Rihanna while she soaked up the sun in her home country of Barbados. The musical diva chose to cover up with a gray cardigan and accessorize with a jungle-print headscarf and sunglasses as she splashed in the water and strolled along the sand.

Meanwhile, 34-year-old Kruger -- who is more than a decade older than Riri -- added a menswear-inspired straw hat and gold chain necklaces while lounging poolside with her beau.

So we gotta ask: Is the fierce one-piece suited for the younger set (à la Riri) or can a woman in her 30s pull off the look?