There is only one possible reason Scott Eastwood was working out in Santa Monica without a shirt or shoes, but WITH jeans and a giant belt buckle -- and you're looking at it.

When you've been blessed with looks and a body like that ... you show it off as much as possible.

Then again ... maybe Clint's son is just prepping for a sequel to his "Funny or Die" video where he plays with dogs. The rest of us just don't stand a chance.

Ronda Rousey spent more time throwing punches on the set of her Sports Illustrated Swimsuit Edition modeling shoot ... than she did during UFC 184 ... and now there's video of the scantily clad workout.

SI just released the video ... in which Rousey says she was WAY more comfortable doing martial arts poses during the shoot than the traditional kissy-face looks.

Here's hot Brazilian model Natalia Borges playing some beach football in Miami Beach ... with her NYC nightclub honcho fiance Michael Satsky.

Drake did a little importing for his Australian tour -- flying in a hot chick -- from NY to keep him company.

The "If You're Reading This It's Too Late" rapper was chilling at his hotel pool in Perth, Australia, wearing a smoking babe in a bikini, named Bernice Burgos. We're told they met back in NYC, and they've been "knowing" each other since 2012. Drizzy immortalized her in his verse for the song, "Odio."

She's clearly hot enough to warrant a plane ticket half way around the world.

By the way, rare shots of Drake shirtless. He ain't hardcore, but he's looking ... fit.

Hey Rory ... you seein' this?

Check out these pics of tennis superstar Caroline Wozniacki -- featured in her very own spread in the Sports Illustrated Swimsuit Edition.

It seems Wozniacki's really let loose since golfer Rory McIlroy broke off their engagement last year -- she's been on several girls-only trips with her BFF Serena Williams ... and started posting all sorts of hot bikini selfies.

And now she's upped her game in the new SI pics ... even showing off her ass.

Caroline isn't the only athlete in the mag -- UFC badass Ronda Rousey also got a spread.

Stay tuned for those, but in the meantime ...

On the left we have Amber Rose, jet-skiing earlier this week in Miami ... while on the right we have Kim Kardashian, putting her ample backside to good use while vacationing in Thailand last year.

The question is ...

One thing you can say about Amber Rose ... she's a crack jetskier.

Amber made waves Monday as she traversed South Beach in all her glory.

Amber Rose ... gluteus to the maximus.

Salma Hayek is not one to flaunt her curves -- we rarely see her rocking little black bikinis -- which is why we're showing you these pics of her ... rocking a little black bikini.

Salma was yachting in St. Barts with her husband Francois-Henri Pinault over the holiday weekend.

Mark Wahlberg was caught swimming with a floatie this week in Barbados ... and by that, we mean his wife Rhea Durham's beautiful ass.

Former "Game of Thrones" hunk Jason Momoa took his man muscles down to Rio de Janeiro ... reminding us why he's the perfect choice to play Aquaman.

Karrueche Tran is a single woman -- at least until she gets back together with Chris Brown for the umpteenth time -- but in the meantime, she's flaunting her single body all over Miami.

It's not hard to see why Chris kept going back.

Ryan Seacrest has broken up with his girlfriend -- so we've learned -- and is out on the town with a new, attractive blonde chick.

Ryan was leaving the GQ Men of the Year party Thursday night at the Chateau Marmont in West Hollywood and his GF of more than a year-and-a-half, Shayna Terese Taylor, was nowhere in sight. That's because we're told Seacrest said bye bye.

Actress/singer Zoe Kravitz donned what barely qualifies as a bikini as she frolicked in the ocean ... Wednesday in Miami.

Victoria's Secret model Nina Agdal firmly planted herself on all 4s ... then opened wide for her extremely lucky boyfriend.

The supermodel's BF Reid Heidenry gingerly hydrated her Saturday in Miami with a brewski.

And he got a reward in the end.

And how was your weekend?

Twihards, prepare to be extremely jealous of FKA Twigs ... Robert Pattinson is showing solid PDA with his new chick -- grabbing a heaping handful of her cheeks.

The famous couple went to lunch Friday in L.A. and Edward proudly squeezed his new moon.

Still doesn't excuse his new haircut ... but we're guessing Twigs likes the doo -- and it probably helps RPatz play grab ass with her more often.

Glass is half full.