By Breaking Celebrity News Staff

The X Factor judge Demi Lovato has worked hard to regain her wholesome image, but Breaking Celebrity News has exclusively learned that the former Disney star is still partying hard behind the scenes.

Despite a stint in rehab for "emotional and physical issues" in November 2010, those close to Demi say there are a few habits she didn't drop.

"Demi has really busted her butt to get her career back after the incident with the Jonas Brothers backup dancer and rehab and stuff," an insider exclusively told Breaking Celebrity News.

"But she's not as sober as she's leading everyone to believe and is still partying hard."

A second source claims Demi, 19, isn't as reckless as she once was with her partying and keeps it away from the prying eyes of the paparazzi and safe within her close-knit circle of friends.

Ironically, just last week Demi scolded two The X Factor contestants who rapped about taking bath salts during their audition.