Justin Bieber Delights Fans With Ripped, Pumped, Shirtless Gym Session, Clocks Amber Rose

Justin Bieber posts ripped, shirtless, bulging biceped, photos of himself pumping iron in a gym. Not surprising, some fans forgot about how much they hate Selena Gomez and took to social media. Mostly incoherently.

Justin Bieber is ripped. Completely. His fans may be divided over his reunion with on-again, off-again girlfriend Selena Gomez, but over the R&B/pop superstar’s body they are a united nation.

The 20-year-old, who has been accused by some of his fans of slacking on his social media activities recently, is back in their good graces after posting an Instagram five-photo collage of himself on Thursday pumping iron like a man possessed.

As if we didn’t already know, what with the Bieb’s shirtless habit, the slightly-built kid of years past is all grown up – physically, at least, and has been replaced by a ripped, toned, bulging biceped, bona fide heartthrob.

All of which is the result of a hardcore weights regime designed by Swedish trainer Patrick Nilsson, who travels full-time with the singer.

Yahoo Entertainment reports Bieber fans poured onto Instagram and Twitter on Thursday to express their considered appreciation over their idol’s ripped and heavily tattooed physique.

Within minutes of Justin’s gym post, which he captioned “Back in the gym #dontbescared #orangegymrats,” the Instagram had attracted hundreds of thousands of “Likes.” At the time of press, that figure is now 1.06 million — and counting.

“Hot like FYA!,” one admirer gushed; “Come back to brazil (sic),” another fan begged. “No cause he’s mines,” one argued back. Many more comments were variants on those themes.

(Photo: via Instagram.)

Bieber’s body-conscious gym post comes a day after a gossip report claimed Gomez wants to enhance her breasts size [“boob job”], in a bid to keep her resumed romance going.

It’s claimed the 21-year-old actress-singer desperately wants to keep Bieber interested, and thinks going under the knife could stop him from seeking pleasures elsewhere.

“Selena is putting a huge amount of pressure on herself to be sexy because she’s afraid of losing Justin,” an alleged and likely fake ‘insider’ told Hollywood Life.

“She’s been asking people if they think she should get her boobs done because all the girls he was with have bigger boobs than her.”

The purported source went on: “She feels like she needs to be the hottest girl in the world to keep his attention.”

“She’s studied every girl that he hooked up with while they were broken up, at least the ones she knows about — and compared herself to them down to every last detail. For God knows what reason, Selena has really low self-esteem, she has a long list of things she thinks she could improve as far as her appearance.”

“Even though she’s so beautiful she sees all kinds of flaws when she looks in the mirror,” the alleged confidant probably didn’t add.

(Photo: via Instagram.)

But, while it’s true Bieber and Gomez’s relationship history is almost comically patchy — the twosome began dating in 2010, first split in November 2012 and have seen each on and off since -— a source recently told PEOPLE Justin is showering constant attention on Selena.

“Justin’s extremely doting on her, and there hasn’t been one second where he hasn’t been touchy-feely and sweet with her,” the insider confided.

“They’re pretty inseparable and very affectionate.”

On Tuesday, the Nialaya jewelry store revealed on Instagram that Bieber visited their flagship Melrose Avenue store to buy bracelets for himself and Selena, so it seems he is happy with his girlfriend just the way she is.

Additionally, Gossip Cop reports a Gomez source confirmed the starlet is not contemplating any surgical changes.

That said, Bieber might want to avoid getting an eyeful of the ladies when he’s out and about. Last night, he partied in Los Angeles with the likes of Jermaine Dupri and Amber Rose. The imp later posted a snap of himself with La Rose and it seems he was staring at her bosom.

“Good night with friends,” Justin captioned the Instagram, while Rose wrote next to hers,”The Biebs @justinbieber wanted a pic with Muva and I him. He’s a sweetie pie.”

(Photo: Bieber appears to stare at Amber Rose’s assets.)

Meanwhile, Bieber’s meta-gym Instagram has now racked up to 1.09 million hits.

Those Beliebers know what they want.

(Video via Instagram, Manager Scooter Braun and Justin Bieber hit the steam room after gym session, in very different ways.)