Update: Fights, Partying Put Demi Lovato in Rehab

Camp Rock star Demi Lovato, 18, has decided to leave the Jonas Brothers World Tour to enter "medical treatment for emotional and physical issues she has dealt with for some time," according to her rep.

"Demi has decided to take personal responsibility for her actions and seek help. She is doing just that. She regrets not being able to finish her tour, but is looking forward to getting back to work in the near future."

Fans have been wishing Demi a speedy recovery on Facebook and Twitter. One facebook user posted "If it's true that you are in a medical center i hope you get well fast and you heal ur heart. You are a very talented girl and a lot of us will be waiting for you to come back whenever u are ready!" According to TMZ, her decision to enter treatment has nothing to do with drugs.

According to People.com, Lovato, 18, had a fight with a dancer on the Jonas Brothers world tour.

A source close to Lovato's family told People that the problem with Demi started before the fight.

"As she did on most nights off, Demi invited her band, dancers and her parents to dinner. Afterward, she broke off with a very small group,” said the source. The next day, Lovato’s managers and her stepfather, Eddie De La Garza were concerned about the group’s conduct, as they had been partying. 

"When tour management found out about this, they talked to the people involved, including Demi," the source told People. "Demi reacted badly and perceived that someone on tour had told on her."

Later that day, Lovato was on a plane and decided to confront a girl that she believed had ratted her out. They had a “short, physical altercation,” the source said, adding that the fight was “one-sided.”

"Afterwards, Demi felt awful about her behavior and realized she needed to take personal responsibility for it," said the source. "Because of this, and because of the battles Demi has fought throughout her life, both she and her family realized she needed to take steps to get help immediately."

That's when Lovato decided to seek medical care for her physical and emotional issues at a treatment center.