Selena Gomez's tour dates has just been released last week and latest reports say that she will be joined by Adam Lambert. This partnership has also prompted speculations that they are in competition with Demi Lovato and Nick Jonas.

In a report by the Celebrity Dirty Laundry, Selena Gomez will go on tour with Adam Lambert after Demi Lovato's camp kicked him off her own tour. The "American Idol" alum's name was initially dropped to do some number with Wilmer Valderrama's girlfriend but he was reportedly replaced by Nick Jonas.

According to a source, Adam Lambert went furious over the matter and that his team called the "Neon Lights" hit maker as "unprofessional" and "unethical."

"Our sources say Demi's people locked in Adam to join her on tour and they were working out details like lighting, billing, etc.," an insider from TMZ said.

"Demi and Adam had agreed on the essential terms, including money...Demi and Nick are repped by the same manager and we're told the manager wanted to place Nick in a tour, because he's hot now and didn't have one, so he convinced Demi to dump Adam for Jonas."

With the development, Selena Gomez has taken Adam Lambert on her own "Revival" tour.

"SelGo is already plotting to make sure that her and Adam's tour blows Demi and Nick's tour out of the water," the CDL report added.

It has been apparent that Selena Gomez and Demi Lovato are no longer friends after years of being pals since their Disney days.

Over the weekend, Adam Lambert took to Twitter to air his side and cleared that he and Demi Lovato are okay, Inquisitr said.

"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?" he said.

To which Demi Lovato replied, "Just goes to show how accurate @TMZ really is... I love you @adamlambert."