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Jennifer Hudson makes her debut as a coach on NBC's "The Voice" this season, which seemingly will be her first and last season on the popular singing competition show. Radar Online claims that the cast and crew are struggling to handle the singer's "diva antics."

A well-connected production source tells the site that Hudson's bickering with fellow coach Blake Shelton is a nightmare for producers. "Blake cannot stand Jennifer at all. The two are constantly at war both on-camera and off-camera," the source reveals.

Things really go downhill "to the point where he cannot even talk to her or look at her," the source further says.

Hudson, who previously won "The Voice UK" before joining Shelton, Adam Levine and Miley Cyrus for current season 13 of the U.S. version of the show, doesn't only rub Shelton the wrong way. The source claims that the 36-year-old singer "is hated among the crew too."

The insider dishes that "Jennifer does not show up on time and is a complete diva when she does." The insider also claims that "she is constantly complaining about her outfits and is always unhappy with her hair and make-up," adding, "But honestly there is only so much that they can do!"

In addition, "The Voice" folks are reportedly not happy with how Hudson uses the show to promote her own production, JHud Productions. She was even warned by the NBC show's execs for it. "She is using this platform for her own gain and she got reprimanded by execs for it," the source says, adding, "And she still continues to do it anyways."

Her alleged diva behavior probably plays a big part in the show's decision not to have her again in the famed turning chairs for the next season. The upcoming season 14 of "The Voice" will see Alicia Keys returning and joining Shelton, Levine and newcomer Kelly Clarkson.