The Jonas Brothers are using Brazilian Demi Lovato look-alike Juliana Vasconcelos Povoas (known as Jullie) to stand-in for the Disney favorite while she is being treated in rehab, Breaking Celebrity News can reveal.

Lovato decided to leave the Jonas Brothers tour last week and seek treatment for what was described as "emotional and physical issues" after reportedly punching a female dancer on the tour.

VIDEO: Compare Jullie and Demi Singing 'Wouldn’t Change A Thing'