Cheeky Hailey Bieber shows off yellow thong bikini as she lounges in mansion

Hailey Bieber posted an Instagram snap declaring "it's summer," lounging in her mansion in a navy blue bathing suit with yellow straps and staring straight at the camera. The carousel also included a living-room photo showing Snoopy asleep on his dog house on the TV screen.

Kylie Jenner commented "Oh!" and Khloé Kardashian, Jas Tookes and Justine Skye left nearly identical reactions. Justin Bieber has yet to publicly react. She doubled down on it being "summer in [her] book" via Instagram Stories, sharing a water bottle filled with juice, ice and orange slices.

The skincare mogul has been dressing for summer all winter, from a vintage Roberto Cavalli leopard swimsuit in a January slideshow to a recent beachside selfie in polka-dot shorts and a yellow tee pulled up to show her taut tummy.

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