On Tuesdays, she wears pink.

Kim Kardashian posted some sexy swimsuit pics on Instagram yesterday as she modeled one of her new Skims bikinis, going with a Barbiecore look in the sunny snaps.

“pinky swear ?!” she captioned the post, sharing four photos of herself in the Skims Swim Triangle Top ($38) and Cheeky Tanga Bottoms ($36) in a limited-edition light pink shade.

In the first pic, the “Kardashians” star, 42, kneels on the ground as she arches her back and lifts her face up to the sun.

She goes on to pose poolside in the skimpy bikini while shading her eyes from the sun, then sits on a lounger in another snap.

In the last picture, the Skkn by Kim founder dips her feet in the water as a serene backdrop of palm trees and ocean is visible behind her.

Fans were digging the look, leaving plenty of heart and flame emojis on the post.

“Now this is what I call getting up and WORKING,” one fan commented, referencing her viral remarks about women in business and how “nobody wants to work these days.”

“It’s the pink skims for me” another Instagram user added, with a third writing, “42 still slayyyyyy.”

For more Page Six Style …

The Skims founder — who often shows off her line’s fast-selling swimsuits on Instagram — wasn’t the only KarJenner getting into the pink swimsuit action yesterday.

Her mom, Kris Jenner, posted a throwback photo of herself wearing a pink Body Glove one-piece ahead of Khloé Kardashian’s Good American x Body Glove launch tomorrow.

It seems like we’ve got a busy summer of Kardashian bikini moments ahead.