Justin Bieber and his 22-year-old model wife Hailey - who he's believed to have married in September - are celebrating a new "Christmas baby".

The pair took to their Instagram accounts at the weekend to share pictures and video footage of their new "dogson", who they have named Oscar.

Justin shared a shirtless photo of himself with the pooch sitting on his shoulder and wrote: "Meet our dogson his name is #Oscar (sic)"

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Meet our dogson his name is #Oscar

A post shared by Justin Bieber (@justinbieber) on

The cute canine then appeared in several posts on his Instagram Story, with one photo showing off Oscar's new toys and sleep area which was captioned: "Merry Christmas from Oscar."

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The 24-year-old pop star then shared a number of videos of himself and Hailey in bed with Oscar as the tiny puppy crawled across Justin's chest, was showered in kisses by the model, and returned the favour by licking her nose.

The 'Believe' hitmaker ended his flurry of posts with a picture of Oscar fast asleep on a pillow.

Hailey - whose surname before her marriage was Baldwin - also shared a number of videos of her "Christmas baby" on her own Instagram story, including one of Oscar scampering around on the bed adorned with a large blue bow and more of him sleeping.

Hailey's photo of
Hailey's photo of "Oscar Bieber". Photo / Instagram

However, she also admitted the number of dog posts had been an "overload" but she just couldn't help sharing them.

While the couple may be smitten with their new "dogson", Hailey - who is the daughter of Stephen and Kennya Baldwin - recently admitted she "can't wait" to have children and hinted that won't be too far away in the future for the couple.

She shared: "I love kids and I can't wait to have my own. I would say now that's a closer reality."

- Bang! Showbiz