Kylie Jenner, Kendall Jenner and Hailey Baldwin kicked off the summer with some sexy bikini selfies -- because when your whole life is lived for social media, that's what you do!

Kylie, Hailey, Kendall and some pals celebrated the beginning of the summer poolside and of course they caught every skin-baring moment on camera and posted the fruits of their lack of labor on social media.

In the photos, Hailey dons a Solid & Striped Morgan bikini top, which runs for $88, and a Solid & Striped Morgan bikini bottom, which also runs for $88. Kylie got cheeky in a a strappy black bikini that highlights her derriere.

Of course -- the Memorial Day festivities seemed all about the baring of butts. The gaggle of gals perched themselves next too the pool and posed as they grabbed each other's rumps.

Those are some bootylicious babes!


Of course, Kylie and Hailey also took the opportunity to showcase their hip tattoos -- because why not?

The Keeping Up With The Kardashians has a "sanete" on her right hip, which is "sanity" spelled out in the letters of the International Phonetic Alphabet. Meanwhile Hailey has "gente" inked on her, which means "people" in Portuguese and is an ode to her Brazilian heritage.

We think those are pretty dumb tattoos -- but let's look at who has them, not exactly the brightest bulbs!

The pretty young things look like they had a fun day off -- but let's get real, this is basically what these girls do all day everyday!