Justin Bieber struggles to keep his jeans up as he steps out with glamorous wife Hailey Bieber after partying at Vanity Fair Oscars bash

Justin Bieber had a fashion fail as he struggled to keep his jeans up while stepping out with wife Hailey Bieber in Los Angeles on Monday – after attending the Vanity Fair Oscars party on Sunday night.

The lovebirds were dressed casually with the Peaches singer, 29, clad in a pair of his Drew house brand jeans that he had belted very low.

Justin – who accessorized his Oscars party look with a blanket – also wore a grey and white collared, short sleeved jacket over a grey sweatshirt and a bright pink beanie. 

The Rhode Beauty founder, 26, meanwhile, wore boyfriend-cut jeans with a striped polo shirt and a black leather jacket. 

Her choppy bob was parted in the middle and slicked back behind her ears. 

Struggle: Justin appeared to struggle with his pants falling down

Pull up your pants: A photo of the couple from behind reveals the Love Yourself singer had his jeans buttoned and belted below his buttocks

A photo of the couple from behind reveals the Love Yourself singer had his jeans buttoned and belted below his buttocks. 

Sunday night, the Yummy singer slipped in the back door  of the Vanity Fair after Oscars party in Beverly Hills to join his wife. 

Hailey soaked up the spotlight as she wowed on the red carpet in a stunning black Saint Laurent gown. 

Justin wasn’t quite as dressed up as his model wife. The Baby singer had a multi-colored blanket wrapped around himself. 

The Canadian Grammy winner also wore black pants with very wide legs, a black blazer and white t-shirt.

The Sorry crooner had a tan baseball cap on backwards and white dress shoes on his feet.

At the party Hailey commanded attention in the custom Saint Laurent gown which featured a silk shoulder pad and draped sleeve on one side and a glove on the other.

Cozy: Hailey looked comfortable in an oversized leather jacket while carrying a small black purse

Drew house: The singer wore jeans, a jacket and beanie from his fashion brand Drew house

Casual outing: Hailey was dressed down compared to her high fashion uber glamorous look for the Vanity Fair party

It perfectly highlighted her phenomenal figure and was the perfect sophisticated look for the event.

Hailey accessorized with a pair of dangly silver earrings and wore her honey tresses in a choppy bob while opting for flawless makeup.

Earlier on Sunday, the Ghost crooner shared a series of cuddly snaps taken from their latest beach getaway.

In the sweet snaps, the couple snuggled up together on a boat whilst clad in their swim wear.

Justin beamed with happiness as he rested next to his bikini-clad wife, whose pert derriere was visible in one of the photos.

Out for a walk: The couple strolled to their destination sharing some smiles along the way

‘LUV U BABY,’ Justin posted in the caption. Hailey replied in the comments section with an emoji of two hands creating a heart. 

On Friday, Hailey marked the one-year milestone of surviving her mini stroke by reposting a video from last year that detailed her ‘life-changing event.’  

‘Can’t believe it’s been 1 year since I suffered a mini stroke that led to my PFO diagnosis,’ the model wrote. ‘Given that it’s the 1 year mark from such a life changing event, I wanted to share all the information I’ve learned about PFO and share resources to donate.’