JUSTIN Bieber has shared a rare look at his baby son Jack Blues, while celebrating his 31^st birthday – after sparking concern with bizarre behaviour.

The singing sensation posted a video to celebrate his birthday, which included photos with his wife Hailey Bieber.

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The couple were seen sitting on the floor in one black and white snap, with model Hailey sprawled across her husband.

Then in another, the new parents were seen with their little tot Jack Blues, who is six months old.

Jack was seen in a green babygrow and blue hat, as his proud dad lifted him up into the air, as Hailey stood by and watched.

Happy birthday balloons were in the shot, and Justin enjoyed the day with his family and a group of friends.

The couple then tucked into a large birthday cake with icing and colourful sprinkles all over it.

Hailey wished her hubby a happy birthday on her social media, sharing the same black and white snap that Justin had, writing: “Happy Birthday to my love.”

The celebrations come after the dad-of-one posted an alarming video of himself smoking on Instagram amid concerns over his increasingly bizarre behaviour.

Justin could be seen inhaling deeply close up to the camera causing his face to be engulfed in smoke.

The short clip ended with Justin, who is wearing a black hat and hoodie, flashing a toothy smile.

It followed a worrying video shared earlier this week in which shirtless Justin rapped about “flying high like a magpie.”

While past collaborator Diplo commented that the “beat went hard,” fans were more concerned and urged the pop star to get help.

In the clip, tattooed Justin held a large snack bag of chips and waved his arms as a friend danced beside him.

The lyrics, “I go high like a fly guy. I fly high like a magpie. I go high like a bat guy”, left his followers confused.

Underneath the video, one follower wrote, “He’s desperate for help! Justin you are so loved!”

As an additional user claimed, “I’ll be praying for your healing.”

Justin failed to address their fears directly, instead he posted a close-up snap onto his story that saw him smirking towards the camera.

A new thread about the popstar has also been created on fan forum site Reddit in which fans are sharing their concerns.

One wrote, “His look seems so sad, empty and unhappy,”

As a second user commented, “I definitely think he’s reached his limit and this is a cry for help, cuz he doesn’t know who to turn to.”

Despite the concern, his rep insisted the star is actually in the best shape of his life.

“The recurring narrative that Justin is using hard drugs is absolutely not true,” they told TMZ, before adding that Bieber is actually “in one of the best places in his life.”

Behind the scenes, Bieber has been cutting off members of his inner circle.

The rep said that the last year has been “very transformative” for Bieber, and that he “ended several close friendships and business relationships that no longer served him.”

However, an insider told The U.S. Sun that fatherhood is taking its toll as is the stress of mounting a musical comeback.

They said, “There’s no question he’s also exhausted, and as much as he loves being a first time dad all the late night diaper changing and interrupted sleep has taken a toll.

“On top of that he’s been throwing himself back into his music, staying late at the recording studio, fixating over what direction to go with his big comeback.

“It should be the happiest time of his life but instead Justin’s walking around like he’s got the weight of the world on his shoulders.

They added, “For the most part, Justin and Hailey are pretty good at ignoring all the hysterical fan chatter.

“But for people to take it to the next level accuse him of being under some type of influence is on another level entirely, and it’s the big reason they’re coming out swinging with that very heavy public denial.”

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