After less than a year of dating, singer Aubrey O'Day and DJ Pauly D have called it quits. The former Danity Kane songstress confirmed to E! News back in February that she and the former 'Jersey Shore' star had been together for a couple of months after meeting on E!'s upcoming reality show, Famously Single. But, a source now confirms that that they've decided to break up because of his busy schedule. The insider added, "They were never that serious. They dated, but it fizzled out. He's on the road a lot. He's playing different gigs every night, and he's just not looking for something serious."