(Cover) - EN Showbiz - Christina Aguilera is "consistently about two hours late" to The Voice set, a source reveals.

The singer is a judge on the US version of the talent show along with Blake Shelton, Adam Levine and Cee Lo Green.

Christina's tardiness has reportedly irked executives to the point that they've been forced to fine her.

"Christina is consistently about two hours late," a source told Radar Online. "For season three this has got to stop."

The singer doesn't seem to be taking the measure seriously.

"Whatever her fine is now doesn't bother her," the insider continued. "She has so much money she probably doesn't notice. Higher-ups on the show want to raise it to a number that does bother her so she actually arrives on time."

Christina's fellow panelists aren't impressed with her lack of time management either.

"They can't stand how late she is," the source said. "They know she's a girl and she takes longer to get ready, but this is ridiculous. And when she gets to set she still has to go through hair and makeup."

It is rumoured that Adam became so enraged with Christina on set Monday evening that he screamed "f**king c**t" at her in front of around 70 people. (C) Cover Media