Kourtney Kardashian, Shay Mitchell and More Sizzling Celeb Swimwear Pics!

Kourtney’s life seems like a permanent vacation lately (she was just yachting in St. Tropez, France and hitting the beach in Miami). And it seems she exclusively packed the coolest, most colorful one-piece collection possible with her Khlo$$$ one-piece, deep V-neck yellow suit and most recently this sexy lace-up peach onesie.

We wouldn't think after indulging in pizza and pasta all week in Italy that the cleanse you'd most want would be a shower in a sexy cutout one-piece. But it seems to be working for Shay.

It pays to have your own line of swimwear — that way, your business trips also double as a decadent getaway.

Rosie shows off her sexy and sweet sides in her cute Boomerang dispatch from paradise.

Once you get over your envy of Kourtney's yacht-side waterslide in St. Tropez, France, please note that she is wearing a Khlo$$$ one-piece, which her sister (the aforementioned Khlo$$$) has approvingly Instagrammed.

Diane Kruger has some stiff competition for the role of C.J.'s understudy in the Baywatch remake now that Olivia has picked up this red hot one-piece.

The Duff sisters serve up two important things in this pic -- a smoldering smize and serious bikini envy in their too-cute tops.

Elizabeth knows you can't properly soak up the last rays for summer without a series of sexy bikini-clad pics.

Another week, another teeny string bikini from the model, complete with a cheeky back view too, of course.

Cara took some time offline during her vacation this summer, but still managed to get some sexy swim shots while she was away.

The actress gets creative with cutouts in her side-splitting yellow one-piece.

That's the pose of a pro model… or someone who's had a lot of practice rinsing off seaside. She's practically been living in sexy swimwear all summer long!

Yes, that's Sharon Stone killing it in a leopard-print bikini. And yes, she's 58. Insert 20 hand raise emojis!

Bethenny may have been the catalyst for some of the most dramatic arguments during the Real Housewives of New York City's season 8 reunion this week, but she doesn't mind poking fun at her image, writing in her caption: "I'm a real beach."

For as low-key as the model's pretty lavender two-piece is, it's indexing pretty high on the "want that swimsuit" spectrum.

Summer may be over, but that doesn't mean we're not snapping up Katie's palm tree-print Wet Swimwear one-piece for next year. (Because, bonus! It's currently on sale.)

Whitney hits all the bases for standout swim style: adorable Solid and Striped two-piece and chic cover-up, plus a handy beach-theme Zubi Madrid zip pouch and colorful flip flops.

We're sure Kelly Rohrbach will do just fine filling in Pamela Anderson's iconic red one-piece as C.J. In the new Baywatch re-boot, but in case she needs an understudy, she should definitely call on Diane.

You may have been able to guess that it took incredible core strength to achieve those gold medal-winning gymnastics feats, but three of the Final Five gave us photo proof on the beaches of Rio.

Full moons just bring out the cheekiness in some of us.

If you think Emily's bikini is hot from the front… you clearly haven't seen the back view yet.

Vacation is smooth sailing for the supermodel — at least if her graphic-print sailboat Triangl bikini is any indication.

"My friends went to the beach today and posted pictures. So now I am," she wrote on Instagram. "Insert inspirational quote." Sarah, the world needs more truth tellers like you.

No surprise the Victoria's Secret model can make a Solid & Striped one-piece look as sexy as a barely-there bikini.

There's no better way to break in a cool new swan raft than with a series of bikini belfies.

The only thing that could distract us from that idyllic backdrop is that adorable multi-color crochet bikini.

Among the star's summer goals? "Finding a way to wear fur in the summer," she wrote. Mission accomplished, we guess?

Nothing says "living my best life on vacay" more than a coconut drink in hand and a teeny tiny palm tree-print bikini.

Some might have bikini body envy from Kylie's birthday shoot. We're more about the AirBNB envy.

Between her "cool dude" Lonely Lingerie swimsuit and old school oversize glasses, she's bringing retro dressing to the beach.

Even when on vacation, Kendall's never not working – just check out that balcony pose.

And even a semi-retired supermodel like Cindy can't turn off the pro posing when lakeside.

No, she didn't just step off a glam yacht with her messy hair and adorable floral-print bikini, this is the Real Housewives star's "#wokeuplikethis look.

When on a Turks and Caicos getaway for a friend's birthday, it's only polite to dress like the birthday girl of honor, as Bella demonstrates with her Kylie Jenner-appropriate high-cut thong-style denim suit.

"19 & 20" could refer to the sisters' ages… or the number of takes (in the thousands) we assume it took to get to this photo.

We said it before and we'll say it again: she's the most high-fashion Bachelorette in the show's history. Just check out that adorable crochet bikini top she chose for the couple's first official outing after becoming engaged.

The Brazilian model may have an official job as an NBC late-night contributor at the Rio Olympic Games, but you can't expect her not to take advantage of the city's beaches, too (and while decked in patriotic attire, no less)!

Someone get Reese to Rio, stat! She captioned the video of herself diving into the pool "I'm no Katie Ledecky, but I tried!" Looks like at least silver to us!

Britney's suitcases were filled with a slew of sexy halter tops for her Hawaiian vacation…

…to wear when she wasn't boating topless, that is.

Cute coverup, stylish shades and itty bitty bikini — Olivia just simplified the must-have getaway packing list.

For Kylie, the definition of "birthday suit" (worn to ring in her 19th year) is a high-cut one that matches her fiery new wig and is accented with gilded body chains.

The only thing more fire than the models' swim style is their on-point accessorizing skills.

Wherever Kate's heading in her #TakeMeBackTuesday throwback pic wearing that sporty outfit and those tropical accessories, sign us up, too!

Jamie's swimsuit style is just as chic as her everyday wardrobe: simple, streamlined and on-trend.

You know the old saying: Friends that wear thong-style bikinis together, stay BFFs forever.

The Food Network star serves up a course of workout inspo with a side of bikini envy in her sporty Jolyn suit.

What happens in Vegas… may end up on Drew's Instagram account! (Luckily she and her besties were ready in their cute swimsuits.)

The model soaks up "every bit of summer" with … what else? Some impromptu poolside modeling.

Sure, the Olympics in Rio de Janeiro are going to be all about the thrill of victory and the agony of defeat -- but they're also going to be all about Brazilian supermodels looking hot all over their home country as unofficial ambassadors (case in point: Alessandra).

Nobody takes "living one's best life on vacation" more seriously than Lupita, who coordinates her lemon yellow Shoshanna bikini with the citrus-colored pillows at her Bali resort.

The Kardashians continue to be on the cutting edge of lounge accessories -- they were pioneers in the swan raft space, and now Kourtney has moved on to the "cute fruit" category with her cherry float.

Why is the model so happy? Because she's wearing a suit she designed for Swimsuits for All, of course!

When you're in Rihanna's home country of Barbados, you're not going to wear just any two-piece with a big tee as a cover up -- you're going to bring it in a big way, as Chanel does in her braided yellow bikini and rainbow fringe jacket.

Denise's beach motto? Have boogie board and cute Jolyn bikini, will travel.

The Aerie model soaks up the sun poolside in a teeny turquoise two-piece.

We'd be his happy too if we were wearing the star's adorable striped bikini in a gorgeous pool in Bali.

Ahoy! Captain LiLo steers her boat in style wearing a turquoise bikini and a statement caftan featuring a large leopard.

Don't let the model's adorable “little buddy” distract you from her chic blush one-piece.

What kind of swimsuit do you wear poolside in Vegas? One that can double as lingerie like this dominatrix-style Perfect Peach design.

The queen of itty bitty bikinis keeps a good thing going in her rust-colored Indah bikini, worn with One x One Teaspoon shorts, Ancient Greek sandals and a straw hat while on vacation in Greece.

Doing Baywatch-style slow-mo runs along the beach is just another day in the life of a supermodel (she's on set at a photoshoot).

Hanging out with a supermodel squad (consisting of Joan Smalls, Constance Jablonski and Alessandra Ambrosio) in Saint Tropez clearly had an influence on on Sofia — who saw how easy it was to turn a quick shower into a modeling session in her Solid & Striped two-piece.

Kaia claims she's the “biggest goofball” but all we see is the world's next biggest supermodel in her Solid & Striped bikini.

Vanessa is supplying views for days in a snap from her Italian getaway.

Kourtney may have “short girl problems” according to her Instagram caption, but her bikini game is undeniably strong.

We're not sure which is cuter – Jenna's bright suit or her cute Jenna's bright suit or her cute Boomerang action showing off some excellent diving moves.

The star Instagrammed another shot to be sure you get the rear view of her cute print two-piece as well – after all, if you don't, you'll miss her tattoo (which per her hashtag, is #coolandidontregretgettingit).

What does this photo inspire more: the urge to hit the gym or the urge to buy her Kiini two-piece?