Halle Berry is celebrating her last year in her ’50s in her skivvies.

The actress shared pictures of herself taking a swim on a huge yellow inflatable duck in her underwear Sunday.

Berry — who’s currently on a tropical getaway with her boyfriend, Van Hunt, to celebrate her 59th birthday — struck a few poses, including kicking her feet up in the water and laying back with a beverage in hand.

“Making the most of a cloudy day!” she wrote on Instagram.

Berry rocked her natural waves and added a colorful flower crown rather than a birthday hat.

Rather than one of her trademark skimpy bikinis, Berry wore a Uwila Warrior lace camisole ($68) paired with the brand’s matching silk briefs ($45), both in the color Spicy Orange.

The “Catwoman” star turned 59 on Aug. 14. She shared pics of h

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