Halle Berry is marking the 20th anniversary of her titular role in “Catwoman” … by ditching her top and taking photos with a couple pussy cats.

HB just posted a series of pics, and she’s topless and using two rescue kitties to cover up her exposed body … particularly upstairs.

Halle’s wearing nothing but some black panties and a black and silver cat eye mask … which pairs nicely with the black and white felines in her photos.

“Catwoman” came out 2 decades ago on July 23, 2004 … with Halle starring as Patience Phillips in the action thriller.

Halle says after all these years it’s “STILL… meow!”

She’s reflecting on the flick, of course … adding, “It’s been 20 years today since I had the honor of bringing this iconic character to life. She will always be close to my heart and I will forever be Patience Phillips aka CATWOMAN!”

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As for her feline friends, Halle says the kitties showed up in her yard one day … and she’s thanking a fan named Jee for rehoming them.

We gotta say … 57-year-old Halle looks amazing here, and that’s reflected in the IG comments.