If a source on the set of NBC's The Voice is to be believed, contestant Tony Lucca's Adam Levine-inspired choice of Jay Z's "99 Problems" for his final solo performance caused an "explosive fight," according to RadarOnline.com. The song's chorus, "I got 99 problems but a bitch ain't one," was a reference to Lucca and Levine's relationship to a "highly offended" Christina Aguilera, says the unidentified spy. "Adam and Tony wanted to call Christina out as a bitch," says the source. "It was completely aimed at her. It was Adam's idea, but Tony absolutely loved it."

The source says NBC tried to step in and change the offending lyric to "chick," but the Maroon 5 frontman wasn't having it. "He said changing the song would be a death sentence [for Tony]." During the broadcast, Christina said she felt the song's lyrical content was "derogatory towards women." Adam and Christina then argued over the meaning of the song until Adam informed her the words were a metaphor for living a hard life.

The gossip site also says Adam "blew up" at Christina when the coaches rehearsed "Free Your Mind," calling her "the biggest f***ing ****."

The source says an "immature" Levine then locked himself in his trailer after the blow up, delaying production. "Christina is so sick of Adam being looked at as the golden boy of the show," the spy tells RadarOnline. "If America knew how disgusting he was, they would be appalled, she always says." The season finale of The Voice airs Tuesday at 8 p.m. Eastern time on NBC.