Justin Bieber, Selena Gomez split

Musician Justin Bieber speaks an interview with Elvis Duran for "The Elvis Duran Morning Show" at Bagatelle Restaurant on March 24, 2012 in West Hollywood, California.

It's time to start fighting over Selena Gomez's sloppy seconds. Entertainment news sites and the Associated Press are reporting that popular celebrity couple Justin Bieber, 18, and Selena Gomez, 20, have broken up. While Justin Bieber's rabid young fans, who call themselves "Beliebers," will probably be happy that he's single, they should know that he's only single because Selena dumped him. That's got to sting.

"Selena broke up with Justin about a week ago. It's been a really challenging experience over the last year because of their crazy schedules," an anonymous "insider" reportedly told US Weekly. "Selena definitely had some major trust issues with Justin."

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E! News also quotes an anonymous source. "Because of their crazy schedules, it was getting harder and harder to maintain a relationship," the source told E! News. The couple had been dating for almost two years (which, like dog years, is much longer in Hollywood relationship land), and went public with their romance in February 2011. Rumors of the split surfaced on Thursday when Bieber was spotted with Barbara Palvin, a Victoria's Secret Model.

An anonymous source also cited busy schedules as a factor in the break-up to the Associated Press. 

Justin's fans reacted on Twitter with shock and joy, but mostly just joy.