Exclusive Photos: Inside Bieber’s Weed-Mobile

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Holy 420, Beiber! Inside the party palace on wheels that Justin used to smoke “burrito-sized” joints!

Talk about going up in smoke! Justin Bieber loves to smoke marijuana – so much so that the troubled pop star turned his van into a weed bunker on wheels, and only The National ENQUIRER has exclusive photos of him partying in it with on-again off-again girlfriend Selena Gomez.

The entertainer and a group of hard-partying pals drank beer and reportedly smoked weed on the way to Knott’s Scary Farm in Buena Vista, Calif., one September night in 2012, with all the party favors provided by 20-year-old Bieber, says a friend.

“They hotboxed and drank Heinekens from the fridge Justin keeps in the van,” the source told The ENQUIRER. “There was no bong or anything, just Justin rolling his own burritosized joints. I mean, f***ing huge.”

Hotboxing is the practice of smoking in a small enclosed space.

The explosive photos show Bieber and Gomez, 21, with pals including Blake Stuerman, and “Secret Life of the American Teenager” actress Francia Raisa.

“Everyone smoked, including Selena,” said the source. “We smoked at least six joints and were high as a kite by the time we rolled into Knotts.”

As The ENQUIRER first reported, Gomez has had serious drug issues. She did a secret rehab stint just the month before – after realizing how Bieber had affected her.

“Selena came to understand just what a bad influence Justin had been on her life,” said a source. “Their relationship left her broken-hearted.” Confided another insider: “I don’t know whether Justin pushed her to drug use, but among their close-knit friends, smoking was commonplace. “Justin and Selena would regularly smoke marijuana together.”

A rep for Gomez confirmed the singer underwent treatment, stating: “Selena voluntarily spent time at Meadows but not for substance abuse.”

However, a source close to the “Come and Get It” performer revealed that in the months before her rehab stint, she had been “partying very hard.”