Demi Lovato Doing Well in Rehab, Coping With Boyfriend's DeathWhile rumors have been swirling about the reason for Demi Lovato's recent admission to rehab, one thing is for sure -- she's on the mend.

Recent reports alleging that the star is suffering from a cocaine addiction have been shot down by her rep, who says, "Demi Lovato is not in treatment for drug or alcohol addiction,"

The Disney star's father, Patrick, tells Radar Online that Demi is "doing great" in treatment, calling his daughter "such a strong girl."

Lovato, who is receiving treatment for "emotional and physical issues," which some sources have identified as cutting and body image issues, has also reportedly been mourning the loss of her boyfriend, who died in a tubing accident.