The Real Reason Britney Spears Has Been Walking Off X Factor Set During Auditions

"Simon was made fully aware of Britney's medical history before the contract was signed, so this certainly isn't a big surprise that she needs to take breaks during the audition process. Look, Britney basically has the attention span of a 10-year-old at times. It's not alarming to Simon at all and he is fully supportive of Britney doing whatever she needs to do during filming."

According to the Attention Deficit Hyperactivity Association, about 8 million adults suffer from the disorder and symptoms include overall restlessness, poor sustained attention to tasks and impaired impulse control.

"Britney's medical team works with her to deal with her disorder without medication and daily vigorous exercise is what often works best for Britney. Her nutrition is closely monitored and so is her caffeine intake, because that can also enhance Britney's inability to focus. Simon knew what he was dealing with before he ever signed her to join the show and it's not shocking to him. Of course, it's rather disconcerting for people that see her do it for the first time but it's truly nothing to be alarmed at. In fact, Simon would have been surprised if she hadn't taken breaks during judging last week, this means she is involved and engaged in the process," the insider says.