Salma Hayek celebrated National Bikini Day by slipping into a tiny two-piece.

The “House of Gucci” star, 56, showed off her killer curve in a colorful, patchwork bikini on Instagram Wednesday.

“Happy #NationalBikiniDay!????,” she captioned the sultry snap. “Can you believe the bikini has only been around for 77 years?! Let’s hope they don’t ban them too #notathrowback.”

The triangle top put Hayek’s ample cleavage on display while she stared down the camera.

The actress — who often poses in sexy swimwear online — kept her hair down in loose waves and opted for minimal makeup.

Hayek, who stood thigh-high in a pool, accessorized the fun swimsuit with a pair of gold, 3-tiered earrings and her wedding ring.

The post, once again, had Hayek’s 23 million followers questioning how she was seemingly aging backward.

“How old are u again, 23?” one user joked, as another simply stated, “Aging like fine wine.”

“Omg you’re too perfect! You never look older,” wrote a third. “You’re timeless Salma.”

The “Frida” star — who has been married to French businessman François-Henri Pinault since 2009 — is no stranger when it comes to baring it all online.

Just last week, the actress posted a series of sexy sauna photos in honor of World Wellbeing Week — using nothing but two small, white towels to cover up her private parts.

For more Page Six Style …

“Embracing the healing power of the sauna and sweating out the stress this  #WorldWellbeingWeek,” she captioned the post.

Hayek has been turning up the heat all summer, from the blue bikini she wore on a yacht last month to the busty yellow two-piece she rocked while on vacation.

However, she has also been showing off the reality of aging, proudly posting photos of her sprouting grays and aging lines.