Justin Bieber is angry. So angry in fact that he's probably going to drive around the streets really fast or threaten a photographer. Why? Because one of his best buddies paid a visit to his ex-girlfriend Selena Gomez behind his back. That's why.

According to Perez Hilton, King Kevi paid a visit to Selena Gomez's pad last Thursday (April 4, 2013) and although Bieber doesn't believe the pair are seeing each other, he still doesn't appreciate house calls. One source cleared up the situation, saying, "Kevi and Selena are friends. There was a party that night with 15 or 20 people - just a little kick back - and they were hanging out smoking hookah with some buddies. Justin was pissed. He said, 'Yo, why were you kicking it with her? I thought you and I were homies.' He doesn't think they're hooking up but doesn't want his closest friends partying with her." 

The news comes after Gomez faced accusations that new single 'Come & Get It' is about ex-boyfriend Justin. It features the lyrics: "I love you too much, much to hide you, This love ain't finished yet...she sings on the new song, saying that it's about her gaining more confidence as she matures. "...This love will be the death of me, but I know I'll die happily." However, speaking to Ryan Seacrest on Monday, Gomez insisted, "Honestly, to be 100% real. It's not really about a specific person. The reason why I wanted this to be the first single was because it exudes... confidence and strength and that is something I'm willing to share with the world."

Selena Gomez will perform the single at the MTV Movie Awards 2013 later this week.

Selena GomezSelena Gomez At The 2013 Kids' Choice Awards