Demi Lovato's family are outraged by comments made by her estranged father about her going into rehab.

The 'Camp Rock' actress' family insist Patrick Lovato "knows nothing" about his daughter, and he has been warned by her representatives to stop talking.

Patrick - who split from Demi's mother Dianna in 1994 - claimed the pressures of being a child star "was one of the things I worried about when she signed with Disney", after she checked into rehab earlier this week for "emotional and physical issues".

Now Demi's attorney Jamie Young has told the New York Post newspaper: "No one speaks for Demi except for her designated representatives.

"Unfortunately, several people have taken it upon themselves to speak out - both on and off the record - about a situation they know nothing about."

Demi, 18, talked about her father last year, revealing they hadn't spoken to him for two years.

She added: "Two years ago. When somebody lets you down after you've been the only one there for them. I had to cut off all connection. It was hurting me too much."

Patrick has since claimed he was misquoted in the article about his daughter saying he would neither blame Disney or Dianna for Demi's problems.

Disney has wished their young star well, with a statement reading: "We support Demi's decision to put her health first and we send her our best wishes."