Credit: Aldo Rossi/FOX ©2011 Fox Broadcasting Co. Photo: Stacy Francis is in the Top 4 Over 30s on The X Factor

Oh, Stacy, say it ain’t so! According to a source behind the scenes at The X Factor, 42-year-old belter Stacy Francis has been showing quite the diva attitude off-camera.

Stacy — who has repeatedly wowed the judges and audience with her incredible pipes — may sing like an angel, but the word is that her behavior has been anything but angelic. Is it possible that Stacy’s sweet, insecure demeanor has been masking the total terror within? It certainly sounds like it could be, based on reports from backstage.

"If there is one contestant who has already let fame get to their head, it's Stacy,” a contestant’s family member told RadarOnline.com. “The others are sick of it, she is snapping at them all the time and being like a bratty teenager..."

The source added that "Stacy turns on the charm for the cameras, but off camera she's a complete diva. This week she had a showdown screaming at one of the crew so loud that we could all hear it at the other side of the building.”

Yikes! Stacy’s been a standout on The X Factor since her “Natural Woman” audition, but she always seemed so humble. Of course, this is a competition so how much do we expect another contestant’s family member to rave about the uber talented Stacy? Answer: not much.

Prepare for more claws to come out when the live shows kick off on tomorrow, October 25.

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