Justin Bieber NAKED -- It's My D**k In a Guitar! (Photos)

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Justin Bieber
NAKED
'It's My D**k In a Guitar!' Justin Bieber is wise enough to know when a gift needs givin' ... but he didn't have a box -- so he covered his junk with a guitar and jammed out a naked serenade for one lucky lady fan -- HIS GRANDMA!

TMZ has obtained photos of a completely nude Biebs strumming away on his big wooden instrument ... at his grandmother's home in Toronto during Thanksgiving back in November 2012.

And why, you ask, did Bieber go ass naked for g-ma?

Our sources tell us JB had been staying at his granny's house during the holiday ... and slept in a little too late on Thanksgiving morning.

Bieber finally woke up after hearing family and friends stirring around the house -- so he thought he'd prank 'em ... by grabbing his guitar and playing a naked set a la Jenny from "Forrest Gump" ('memba that?).

We're told birthday-suited Bieber went right up to his grandma and started belting out some impromptu lyrics ... like, "I Loooove you grandmaaaa ... how are youuuu ... helloooo grandma."

We're told G thought it was pretty funny -- and everyone in the home was cracking up -- but granny begged the pop star to get back in his room to put some damn clothes on, stat.

Thanksgiving -- they go balls out.

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TMZ Live -- Lady Gaga Video -- Why She Got Naked

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TMZ Live
Lady Gaga Video
Why She Got Naked Lady Gaga's weird, full-frontal meditation video seems like shades of Madonna ... but the woman behind it -- Marina Abramovic -- calls in to defend Gaga's decision to go naked.

Plus, Kate Upton is out of her mind -- she says she was shocked and appalled at being objectified after her first Sports Illustrated Swimsuit Issue cover. 

And, an absolutely shocking interview with Evel Knieval's daredevil son Robbie Knieval -- he admits to be wasted behind the wheel ... and he doesn't plan on stopping. You have to hear this. (0:00) Lady Gaga goes full-frontel for an artsy video -- but is she just copying Madonna? The woman behind the video joins us to explain why she's not.
(6:00) Pamela Anderson and Rick Salomon -- should they make a sex tape ... together?
(10:00) Kate Upton was shocked at how people treated her like an object following her "SI" cover ... SERIOUSLY???
(15:00) Eminem performs publicly for the first time in over a year!
(18:00) Beyonce chops her hair off -- the world went crazy.
(24:00) HIllary Clinton orders salmon ... and now everyone thinks she's running for President. We'll tell you why.
(29:00) "Big Brother" contestant make a kiddie porn joke ... and now cops are looking into it. Overkill ... or right to play it safe?
(32:00) The mother of the guy who saved Usher's son's life wants the singer to perform at his wedding ... out-of-line? Or should Usher totally do it.
(36:00) The floor is yours!
(41:00) It's time again for ... Tim's rejected pitches of the week! Get TMZ Breaking News alerts to your inbox

Sydney Leathers -- Anthony Weiner's Sexting Partner Strips Naked in Hardcore Porn [PHOTOS]

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Weiner's Sexting Partner
Strips Naked
In Hardcore Porn [PHOTOS]
Ladies and gentlemen, prepare for an epic shock -- Anthony Weiner's sexting partner Sydney Leathers has filmed a hardcore masturbation porn ... and TMZ has some pics from the shoot.

Yeah, we saw it coming -- Sydney paid a visit to Vivid porn HQ in L.A. just days ago ... and Vivid's fearless leader, Steve Hirsch, isn't one to waste time.

We've seen the flick, so we'll paint you a picture. Leathers gets naked, strikes a bunch of stereotypical porn poses, and away she goes ... strumming the old banjo.

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It's your typical boy-sexts-girl-and-girl-gets-a-porn-deal story. You can check out the full video on Vivid's website.

It's unclear how much Sydney got paid.

Most people think Sydney wasn't hot enough for Weiner to risk his political career -- so, as for her new porn, we gotta ask ...

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'Naked and Afraid' Star -- Watch Me Behead this Cannibalistic Snake

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'Naked and Afraid' Star
Watch Me Behead this
Cannibalistic Snake
"Naked and Afraid" star Billy Berger went all King Henry VIII on a snake ... chopping off its head without hesitation ... but it's what he discovered afterwards that's so interesting.

In the never-before-seen-clip of the show -- airing tonight -- Billy and partner Ky Furneaux try to survive in the Louisiana swamplands for 21 days, naked. Needing food, Billy goes snake hunting. Harder than it sounds.

It's pretty ridiculous ... not only does he catch the snake (which is consistently biting him) ... he chops off the serpent's head like he's cutting some breakfast sausage.

Even more interesting ... the snake has an EVIL  past, revealed when Billy guts him.  It's creepy.

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77-Year-Old Golf Legend Gary Player -- I Was Born to Strip Naked for ESPN 'Body Issue'

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77-Yr-Old Golf Legend
I Was Born to Strip Naked
for ESPN 'Body Issue' 77-year-old pro golfer Gary Player didn't do a lick of extra training for his naked debut as the oldest man ever in ESPN's "Body Issue" -- dude says he's been in tip-top shape since birth ... aka the '30s ... yeah, he's that old.

Gary tells TMZ, “I did not do anything special for the shoot" ... other than busting his hump working outdoors on his farm in South Africa everyday for a few months prior to dropping trou for ESPN.

He added, "I was already relaxed, tanned and ready to go.”

Before Gary flashed the family jewels for the shoot 2 weeks ago in Miami ... he says ESPN treated him like a king and provided a serious spread of his fav foods -- including crudités, fresh fruit, hummus, salad, and herbal tea. No wonder GP's in great shape.

As for the whole naked thing, Gary says it didn't bother him one bit -- "I was relaxed and confident in my own skin to do this."

Work it.

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'Naked & Afraid' Stars -- Competed On Show Despite Producers' Gruesome Warning

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'Naked & Afraid' Stars
Competed on Show Despite
Gruesome Warning
Talk about fearless ... contestants on "Naked and Afraid" saw how a snake nearly killed one of the TV show's producers -- and still refused to back out of the competition. 

Sources connected to the Discovery show tell TMZ the players were warned after Steve Rankin was bitten by a poisonous fer-de-lance snake while location scouting in Costa Rica. Rankin barely survived, and as we previously reported ... the flesh rotted right off his foot.

We're told honchos warned players they could face the same fate as Rankin, and gave them the option to quit the show ... which drops naked contestants into the wild and watches them survive.

No one backed down from the potentially deadly danger.

Warning: You can see that danger HERE (if you dare).

The first episode airs tonight, and if you've ever wondered how you'd start a fire if you were butt nekkid in Africa -- watch this clip.

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'Gigolos' Star Nick Hawk -- Naked Photo Shoot ... with a Penis Pump

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'Gigolos' Star Nick Hawk
Naked Photo Shoot
... with a Penis Pump What does "Gigolos" star Nick Hawk have in common with Austin Powers?? They both have a special affinity for penis pumps, baby ... YEAH!

Hawk -- an original cast member on the Showtime series who also happens to be a real-life male escort -- broke out the dong-enhancement device for his recent full-frontal photo shoot for Playgirl ... and TMZ has the pics.

No word if Hawk's penis pump is of the Swedish variety ... unlike some other people we know.