Tiger Woods lost the shirt off his back ... and this time his ex-wife Elin Nordegren had nothing to do with it.

The 37-year-old golf star aired out his man nipples and soaked up the sun by going shirtless on his yacht in Palm Beach on Tuesday.

While his fancy schmancy boat is called Solitude, Tiger spent the afternoon lounging and fishing with his two adorable kids and his sexy bikini-clad girlfriend Lindsey Vonn yesterday.

Although he's no stranger to being in the heat, hopefully Tiger used protection.

Amber Alert!

It was the battle of the animal print bikini bottoms, as bronzed beyond belief Italian fashion designer Roberto Cavalli charred his fine leather goods in pair of skimpy man panties with a much younger lady on a yacht in Monaco this weekend.

The oiled-up 72-year-old has proven he's the total package.

For once in her life, Victoria's Secret supermodel Adriana Lima did not look smokin' hot in lingerie ... because she was too busy looking smokin' hot in a bikini.

The gorgeous 31-year-old mother of two showcased her flawless golden mamacita curves by modeling a bunch of tiny sexy two-piece swimsuits for a photo shoot in St. Barts on Wednesday.

While temperatures have been hovering around the mid 80s ... we hear there is a scorching Brazilian front (and back) moving across the Caribbean island. 

Blake Lively is bootylicious.

Wearing an old school Jennifer Lopez diva hat, a '70s black mini-dress and a ridiculously hot pair of open-toed thigh-high boots, the happily married 25-year-old former "Gossip Girl" star strutted her gorgeous blonde and leggy stuff on the streets of New York City on Tuesday.

Apparently the high fashion walk off was all part of some magazine photo shoot, but who really cares about that ... the important thing is that she looks AMAZING!

Damn you, Ryan Reynolds! Damn you.

Zac Efron proved he's got game ... by flaunting his jacked-up rock hard chest on the set of his new flick.

With his shirt casually unbuttoned all the way, the toned 25-year-old stud played some basketball -- and showed off his ridiculously sculpted pecs and abs -- while filming "Townies" in L.A. on Tuesday.

Last month, Zac injured his right hand on set ... but everything appears to have healed quite beautifully.

Zac may be the one with the ball, but it's everyone else who has to worry about dribbling.

Good thing Kim Kardashian wasn't on the beach in L.A. this weekend ... because she totally would have had a pervy meltdown over these NEW bikini photos of her 17-year-old sister Kendall Jenner.

Kendall was frolicking on the beach modeling some new line of swimwear on Sunday -- fresh off her bikini-clad Greece vacation -- and no one in the entire universe complained even once.

Especially not Kim, who now famously creeped out over her little sister's bikini body in a video she posted on the Internet last month.


FYI, Kendall turns 18 on November 3rd. Not that we're counting the days.

Attention West Beverly High alumni: Steve Sanders is jacked.

Former "Beverly Hills, 90210" star Ian Ziering is getting pumped for his upcoming gig stripping with the yoked man panty crew of Chippendales ... by working out -- with a photographer on hand -- in Studio City on Thursday.

While the 49-year-old's shirtless Vegas stint doesn't start until June ... he's already showing off his peach pits.

WWE Vice President Stephanie McMahon is 36 years old ... a mother of three ... and she's more beefed up than Outback Steakhouse.

Stephanie usually keeps her physique hidden beneath a trademark business suit -- but TMZ has obtained these pics from an upcoming photo shoot for RxMuscle.com, finally revealing the Billion Dollar Princess in all her muscular glory.

As for what keeps her in shape -- Steph is a scary good boxer ... and obviously eats really well (under the tutelage of bodybuilding legend and diet guru Dave Palumbo).

Almost makes you wanna hit the gym. Almost.

Paulina Gretzky just posted this photo on Instagram.

Sorry Wayne ...

Like a lot of sunbathers in Europe, Bruce Jenner went topless on the beach in Greece on Monday.

Throwing modesty out to sea, the 63-year-old showed off his smooth and supple Olympic gold medal-winning chest and rippling abs while paddleboarding in a pair of festive high-waisted board shorts on the Aegean Sea.

Kendall isn't the only Jenner showing off in a bathing suit.

We're not Kendall Jenner's self-proclaimed creepy older sister Kim Kardashian ... but if we were ... we would LOVE these incredible bikini photos the 17-year-old just posted on the Internet.

Of course, Kim perved out over her younger sister's physique in a video she made earlier this month, gushing over Kendall's underage bod ... so just imagine what she'd say about these new pics:

"OMG guys. Just look at my gorgeous supermodel sister Kendall Jenner. She's on vacation in Greece right now and she's so hot and skinny in her little bikini. I'm so jealous. Just look at her body. LOOK AT HER. EVERYBODY LOOK AT MY SISTER RIGHT NOW."

"I know this sounds creepy. Because it is."

Check out Kim's original creeper video below ... but don't watch too closely, you might get arrested.