Justin Bieber and Selena Gomez Split, Again: Starlet 'Hurt' by Beau's Friendship with Ex Nick Jonas, Biebs Strips Onstage as a Single Man [VIDEO]

Reports confirm that pop stars Justin Bieber and Selena Gomez have officially split up - again. Apparently the "Spring Breakers" starlet was hurt and agitated that her "As Long As You Love Me" beau recently sparked up a friendship with her Disney star ex-boyfriend, Nick Jonas. According to a source close to Gomez, the Biebs' ill-timed friendship with the youngest Jo Bro left the 20-year-old brunette beauty sad, offended, and downright angry. Following news of the breakup, Bieber performed at Chicago's Jingle Ball concert on Saturday evening (Dec. 15) as a newly single man, stripping on stage and flaunting his bare chest to the screaming crowd to prove it.

So it looks like 18-year-old Bieber is now "bros" with 20-year-old Nick Jonas... and Gomez is not happy about it. A friend close to the starlet tells Hollywood Life, "At this point, Selena isn't going to any of Justin's concerts ever again. She doesn't want to speak to him anymore and told him it's over." Which explains why Gomez didn't show up to Chicago's Jingle Ball on Saturday evening... during recent Jingle Ball performances, Jelena was spotted constantly cuddling up and canoodling backstage.

The inside source continues, "Hanging out with Nick proved that he wants to just be a jerk about this, and Selena's sick of being heartbroken. They are finished, and I think it's for good this time... Justin and Nick Jonas hung out all night... Selena was crying about it. He wouldn't even return her calls when she found out and called him up."

Gomez's devastation arises from Bieber's hangout with Jonas on Friday, Dec. 14. Apparently the guys were chilling in the studio, competing in some hardcore Ping-Pong games between recording sessions. Check out the tweets that "ousted" Bieber and Jonas' new friendship:

@nickjonas: "Just played @justinbieber in ping pong. Went to deuce both times, but he's the ping ping champion. #Igotyounexttime : )."

@paulephamous: "@justinbieber just beat me and @nickjonas in ping pong. He's a beast on the table!!"

@justinbieber: "in the studio tonight working on the acoustic album...had some solid ping pong matches but... still #pingpongchanmpion."

And apparently that was the last straw for Gomez... she should have listened to her pals (including Taylor Swift) in the first place.

Another source confirms to Hollywood Life that the couple is indeed broken up. What do Mstarz fans think about the recent rumors... are Jelena official done for good?

Whether single or not, it looks like Bieber is enjoying himself. Check out his Chicago Jingle Ball performance, where he strips off his t-shirt onstage. Do fans think the "Boyfriend" star is just trying to get Gomez jealous? (Sorry ladies, the Biebs' pants remain on during the strip tease.