Demi Lovato allegedly dumped Adam Lambert as her opening act on her forthcoming world tour.

International Design Times reported that the 23-year-old songstress' representative already arranged all the details of the "American Idol" alum's appearance from billing to costumes and all. However, Demi's manager wanted to replace the 33-year-old rock star with Nick Jonas.

The former member of Jonas Brothers happened to be on the same handler. TMZ added that they were told the organizer chose the younger brother of Kevin and Joe Jonas because he is a hot item right now and does not have any tour lined up.

Adam, for his part, felt "betrayed" that an exchanged of angry words between the two camps happened. His side claimed that "the switch very unprofessional and unethical."

"The Ten Commandments: The Musical" actor took to Twitter account to show that he does not have any bad blood with the group. "Aww I love you all very much. No beef tween @ddlovato & @nickjonas and me. Biz negotiations are complex- why do we care about the #rumors?" Adam wrote.

He tweeted to clear out the news that they have not had a "horrible feud" and he was grateful to his fans for coming to his defense. HollywoodLife.com reported that the girlfriend of Will Valderrama, on the other hand, tweeted his message and quickly responded with: "I love you @adamlambert," accompanied with a lot of kiss emoticons.

Meanwhile, the "Confident" songstress was actually about to reveal some details of her forthcoming tour last week. However, it was postponed and Demi's camp decided not to do any formal announcement because of what happened.

The Disney alum just recently released her fiercest music video for the track "Waitin' For You" on Oct. 22, Thursday. It was a dark single about fantasy and revenge which featured L.A.-based rapper Sirah.