The Voice has reportedly become The Christina Aguilera Show.

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Since Aguilera returned to The Voice's eighth season, she has reportedly been acting like such a diva that she's driving production crazy, RadarOnline reported.

"She just has ridiculous demands since coming back as a judge, and everyone is wishing she did not return!" a show insider told RadarOnline. "Christina is such a terror to work with. She is frequently late and she doesn't even seem to care or apologize for holding up the filming of the show."

Although they appear to get along wonderfully on the show, according to the insider, Aguilera "is constantly fighting" with fellow coach Adam Levine and "they cannot stand each other."

Aguilera, 34, was an original coach on The Voice but took a few seasons off -- Seasons 4, 6 and 7 -- to focus on her music career and her personal life at home. She welcomed a baby with husband Matthew Rutler in August 2014. When Aguilera was on hiatus, she was temporarily replaced by Shakira and Gwen Stefani.

"Everyone really misses Shakira and Gwen. NBC was actually hoping to keep one of the girls so that they would have two female and two male judges, but Christina said absolutely not, and that she would be the only female judge or she would not do it at all," the insider explained.

Aguilera reportedly feels empowered because she brings in the ratings for NBC.

"She feels that she owns the place and can demand whatever she wants," the insider added. "She has even called it her show!"

To make matters worse, RadarOnline previously reported that Levine and fellow coach Pharrell Williams are at each other's throats. If that's actually the case, coach Blake Shelton must be Switzerland on the set.

The Voice's eighth season currently airs on Monday and Tuesday nights at 8PM ET/PT on NBC.
About The Author: Elizabeth Kwiatkowski
Elizabeth Kwiatkowski is Associate Editor of Reality TV World and has been covering the reality TV genre for more than a decade.