NOT EVERYONE ON IDOL GETS JELLY'S JAM

PLUS-SIZED country crooner Jelly Roll is a big hit on American Idol, as viewership is way up since he came aboard as artist in residence — but sources say his popularity doesn't extend to some of the judges.

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“Jelly Roll is so warm and friendly, he's brought this lightness to the whole set,” reveals a show insider. “Almost everyone loves him — he even has [host] Ryan Seacrest joking around, which is a huge accomplishment these days because Ryan's normally so serious all the time.”

Jelly Roll, 40, helped Idol beat its dominating rival, The Voice, in viewership in a head-to-head battle April 7.

Despite the success, some of the other judges are said to be jealous of Jelly Roll's impact and all the attention he's getting.