Stars In Heat

After recently getting back together, Hayden Panettiere and her giant boyfriend Wladimir Klitschko continued on their face sucking PDA tour by soaking up the sun -- and each other -- on the beach in Hollywood, Florida on Tuesday.

With rumors speculating they are already engaged, a ringless Hayden showed off her lady curves in a sexy purple fringe bikini, while Wlad bronzed his jacked up boxer's physique by going shirtless.

Lindsay Lohan threw on her bikini and hit the beach in Brazil yesterday ... revealing a series of gnarly bruises down her left leg.

It's unclear how Lohan got her new marks ... it's possible she just banged herself up while ducking under tables at a nightclub last week.

Then again, it's not impossible to think she got into another late-night altercation -- just ask that psychic she allegedly socked in the face a few months ago.

Male supermodel Tyson Beckford may have broken the law ... by brandishing his smooth, ripped and inked up fully loaded guns on the beach in Barbados on Monday.

It may have been April Fools' Day, but the jacked up 42-year-old hunk is no joke.

After a long, grueling match, tennis star Andy Murray celebrated winning the Sony Open by soaking his ripped abs -- and farmer's tan -- in the warm waters off Key Biscayne in Miami on Sunday.

While there were no signs of the feds, the 52-year-old anatomically correct Staten Island wise gal attempted to cool off her fully loaded man-made ginormous guns in the warm waters off Fort Lauderdale on Thursday.

Soccer babe Brandi Chastain proved she's still got the goods 14 years after infamously stripping down to her sports bra at the 1999 Women's World Cup ... by flaunting her rock hard bikini bod in L.A. on Monday.

The ripped 44-year-old Olympian went two pieces while practicing dives for the celebrity diving show "Splash." Brandi jumped on board the ridiculous competition series after Chelsea Handler's sidekick Chuy injured his foot and was forced to drop out.

Looks like Brandi will have no problem stomaching the competition.

Here's Arnold Schwarzenegger back in his early bodybuilding days when he was just 19 in 1967 (left) -- and his shirtless 19-year-old son Patrick Schwarzenegger in Miami this weekend (right).

Question is ...

Heisman winner Johnny Manziel wants everyone to know his Spring Break is way awesomer than yours -- 'cause Johnny Football has been tearing it up in Mexico this week.

Texas A&M QB Manziel and his friends have been posting shirtless, boozy party pics from Cabo San Lucas ... the kind that make you wish you weren't chained to a desk at work right now.

TMZ broke the story ... Manziel, who's 20, stirred a little controversy back in January when he was photographed partying with bottles of Dom Perignon after the Cotton Bowl. That turned out to be totally kosher because his mom was with him.

While rumors persist that her engagement to Liam Hemsworth is off, Miley Cyrus tried to find some solace in the comfort of her sexy bikini in Palm Springs this weekend.

The 20-year-old former Disney diva soaked her newly tatted bones at a pool in the desert. Meanwhile, Liam is still off in the Philippines for work.

After being spotted without her engagement ring recently, the breakup reports intensified ... but this weekend Miley tweeted that it's just because the wedding bling is being fixed at the jeweler.

Time will tell if that's all that needs to be repaired.

Attention Bayside High alumni: Zack Morris is jacked!

Zack -- aka Mark-Paul Gosselaar -- showed off his lean, smooth and ripped 39-year-old pecs, bis and abs, while filming a surfing scene with his "Franklin & Bash" co-star Breckin Meyer and Eric Balfour in Malibu on Tuesday.

These days he's saved by the dumbbell.

TGIF bitches ... here's a pic of Victoria's Secret Angel Doutzen Kroes basically getting completely naked in sunny St. Barts today. Absolutely nowhere near you.

It was a bathing suit besties battle as Cameron Diaz and new moms Drew Barrymore and Reese Witherspoon soaked their movie star bones while on vacation together in Mexico the other day.

Question is ..

Action star Vin Diesel showed off his guns ... by flashing his ridiculously buff body while on a magazine shoot with a leopard.

Rihanna got a new pair of thigh-high boots yesterday ... and to celebrate, she took a photo of herself wearing them ... and a g-string.

RiRi instagrammed the pic ... along with the following message: "Gotcha bitch tip toeing on my marble flo'!!! Sick ass custom Prada boots! Miuccia you RULE!!! Thank you."

No, Rihanna ... thank YOU.

There's something or someone hidden in this pic of Kourtney Kardashian -- but this is a tough one. Ya might wanna just give up ... or watch the clip for the answer.