Heartbroken Paris Jackson's Family 'Worried Sick' After Her Breakup With Boyfriend

Breaking up is hard to do!

After Paris Jackson suddenly split with her first love, Chester Castellaw, last week, RadarOnline.com has exclusively learned that the entire Jackson family is "worried sick!"

"Paris is causing great concern for her family," a family insider said. "Ever since her breakup with Chester, she has become quite rebellious."

"They are starting to go through the same thing with her that they went through with Prince last year," said the source.

"She is staying out past curfew, hanging out with a group of people that seem to be misfits, and she is not listening to much that her grandparents Katherine and Joe say."

As RadarOnline.com previously reported, there are still very few clues as to why Paris and Castellaw broke up and she has not even confided in her guardians Katherine, 85, and T.J. Jackson, 37.

"She hasn't opened up to practically anyone about why she and Chester broke up," the insider told RadarOnline.com.

According to the source, her relatives find this especially alarming considering the fact that just two years ago, the 17-year-old had a meltdown that landed her in a psychiatric hospital for almost a year.

While she's made a striking recovery from that time, the only daughter of late King of Pop Michael Jackson is also set to inherit a massive fortune when she turns 18 years old in just a few months, adding to the pressure on her.