Credit: Splash News

Demi Lovato better get her head in the game, because Britney Spears ain't playing. These X Factor starlets are going head-to-head at the judges table, and Star Magazine reports that their jealous cat fights are making everyone on edge!

Apparently, according to Star's source, Demi is sick and tired of Britney being "coddled by producers," while Britney is in a jealous rage about Demi's youthful good looks. The source adds, “Demi thinks Britney is a twit, and Britney thinks Demi is beneath her.”

Britney made headlines when she walked off set during a contestant's performance of her hit "Hold It Against Me," and a source says that “Demi thought it was the funniest thing she’d ever seen, the horrified look on Britney’s face when she heard her song being turned into a mess.”

Source: Star Magazine (via Hollywood Life)