Kourtney Kardashian bares her booty in Miami -- see the steamy hot pic!

Kourtney Kardashian Flaunts Her Incredibly Toned Tummy in a Teeny Black Bikini - See the Pic!

Kourtney Kardashian's Fourth of July weekend is heating up!

The 37-year-old reality star has been soaking up the sun in Miami, Florida, taking to Snapchat on Saturday to give fans a glimpse of her toned booty.

WATCH: Kourtney Kardashian Shows Off Rock-Hard Abs in Teeny Black Bikini

In the pic, the mother of three's backside, clad in a strappy black one-piece bathing suit, is in full focus as she chats with her pal, nightclub owner David Grutman, while relaxing on the beach.

Hot mama!

Kardashian also shared a group pic to Instagram, simply captioning it, "Beach dayz."

Beach dayz.

A photo posted by Kourtney Kardashian (@kourtneykardash) on

WATCH: Scott Disick Shades Kourtney Kardashian Over Justin Bieber Hookup Rumors

At one point, Kardashian, Grutman and another one of their pals enjoyed some "barefoot shopping."

One night earlier, Kourtney was spotted at Komodo, a local high-end Southeast Asian restaurant, to help kick off Grutman's 36th birthday festivities. They continued their celebrations at STORY nightclub, where Kourtney assisted DJ Cedric Gervais on the turntables.

In typical Kardashian fashion, the brunette beauty documented the night over social media, including a mirror selfie taken with BFF Larsa Pippen and a few of their other friends. Check out that tiger-printed dress!

Grutman later shared a pic from their outing to his own Instagram account, writing, "What a night. Thank You so much to everyone that made it so special for me."

What a night. Thank You so much to everyone that made it so special for me

A photo posted by David Grutman (@davegrutman) on

WATCH: Justin Bieber Says He Still Had a 'Great Show' Despite Falling Off Stage in Canada

Saturday night, Kardashian and her crew are expected to attend Justin Bieber's concert at the American Airlines Arena.

As we patiently wait to see pics and videos from the 22-year-old popstar's performance, watch the video below to see what happened when he took the stage in Saskatchewan, Canada, last month!

RELATED: See all of Kourtney Kardashian's sexiest Instagrams

Kourtney Kardashian's sexiest Instagrams of 2016
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Kourtney Kardashian's sexiest Instagrams of 2016
My @cosmopolitan cover on newsstands now!
@cosmopolitan 💙
Yacht club.
Yacht life.
I love this 📸 from October issue of @cosmopolitan shot by @yutsai88 💕
Behind the scenes from my Cosmo cover shoot...on my app!
#ad Love that @fittea is all-natural, gluten free and dairy free, and promotes fat burning. Fittea.com ☕
Just call me the dog whisperer.
Five things I do to get bikini ready in a week. On my app. #LinkInBio
My two favorite swimsuit trends right now, on my app. #LinkInBio
Sundaze 🍒
Short girl problems.
On a Saturday. 🇺🇸
On a sand hill.
Happy birthday to my fly as hell boo! I am so happy I got to celebrate with you today and for the past two weeks lol. I love you so much!
On an adventure.
My Miami sis.
HAPPY fourth! ❤️🇺🇸💙
⭐️🐠 #healthebay #smpieraquarium
#TBT Pregnant mermaid. On my app. #LinkInBio 🐚✨
Styling diaries. On my app. #LinkInBio
Missing Miami. The best ONE-PIECE swimsuits for summer on my app. #LinkInBio
Mirror mirror...
Sooooo excited to announce that I'm the NEW ambassador for Manuka Doctor skincare! Check out my video on @ManukaDr #BeeingKourtney #SkincareFromTheHive 🐝🍯
Selfie camera view.
He kills me.
CASUAL COOL: on my app. #LinkInBio
Sunday funday!
New 📸s on my app. #LinkInBio
TBT: denim on denim on denim. On my app. #LinkInBio
📸 on my app. #LinkInBio
More 📸 with @brendanforbes on my app, link in bio.
TBT: 📸 Annie Leibovitz. On my app, link in bio.
LA nights ✨ Shop the look: slip dresses. On my app, link in bio.
I missed you Mario.
Currently coveting: mom jeans. On my app, link in bio.
Sometimes good morning means goodnight.
I needed this.
Don has been gone for 10 days but he is back! He almost made me throw up...love those kind of workouts.
Shop the Look: NYC street chic. On my app, link in bio.
Tell everybody I'm back in town

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