JENNIFER GREY‘s diva act has the other Dancing with the Stars contestants Lindy hopping mad!

The 50-year-old Dirty Dancing star has even drawn the ire of her soft-spoken partner Derek Hough after she stormed out on him during rehearsals.

"In the beginning, everyone welcomed Jennifer with open arms," an insider told The ENQUIRER. "But now she acts like she’s better than everyone else and above it all.

"Everything has to revolve around her – it’s always me, me, ME!!"

When the season started, no one had any idea that the seemingly sweet actress would transform into a high-maintenance monster.

Jennifer has chalked up some of her bad behavior – such as bolting from rehearsal sessions – to the pressure of performing in front of millions of viewers each week. She was captured on video walking out of a rehearsal after a problem nailing the choreography.

She told a reporter: "Let’s just say we’re human beings. I’m very sensitive, and you know, he (Derek) was frustrated. So what? We’re human beings. Whatever. It’s not that big a deal."

But the insider says the problem is Jennifer’s Jekyll-and-Hyde mood swings. "She can go from sweet and nice one minute to sour and mean the next.

"She doesn’t hang out with the rest of the contestants, and she doesn’t share much camaraderie with the others.

"Even Derek, who has the patience of a saint, has been joking that her temper tantrums have been giving him ‘Grey’ hairs."