Justin Bieber Accepts The Award For 'Ur Fav Artist' For His Song 'Somebody To Love' From Host Selena Gomez During The MuchMusic Video Awards In Toronto
Justin Bieber accepts the award for "Ur Fav Artist" for his song "Somebody to Love" from host Selena Gomez during the MuchMusic Video Awards in Toronto, June 19, 2011. REUTERS/Fred Thornhil

After spending a weekend with Selena Gomez in Canada with his family, Justin Bieber is back in his old self partying with models and old flame. Reportedly taking his relationship with Selena to the next level, the "Baby" singer promised to be exclusive with the actress, but this didn't stop him from going out and having fun with other girls.

Bieber started the night of shenanigans by stripping his clothes at the Fashion Rocks event in New York City. The Canadian singer made an appearance with model Lara Stone to introduce Rita Ora but was greeted by boos from the audience. He eventually "won" them all when he decided to show off his chiselled abs wearing nothing but his Calvin Klein underwear.

After stripping his clothes, the 20-year-old crooner went to Tao Downtown and partied with "Keeping Up With The Kardashians" star Kendall Jenner. To complete the fun, the Biebs run into rumoured ex-fling, Victoria Secret model Adriana Lima.

"Justin was chillin with Usher in the VIP while Joe Jonas dj'd," a source told Hollywood Life. "I think he had something in his shirt lol, he also was with Skrillex. People started going crazy and trying to take pictures of the VIP area—when he saw this he was loving the attention, so he had his bodyguards take him across the venue to a cab on the side of the stage so that he had better access to the crowd."

Based on some bystanders, Bieber doesn't look like he is in relationship as he was surrounded by girls and even wanted to have a picture with them. He partied until 2 a.m., while Usher was there keeping an eye on him.

OK! Weekly recently reported the estranged couple are having "crazy, wild, reckless and unprotected sex." TheHollywoodGossip thinks Gomez, who allegedly suffered from miscarriage a couple years ago, is just lucky she is not pregnant due to not having some precautions.

Justin confirmed to Mark DiCowden that he is officially dating the "Spring Breakers" star and that they are in a boyfriend-girlfriend relationship. When paparazzo Jeffrey Binion's lawyer asked if he has brain damage, the singer simply answered that he doesn't.