The Daily Mail — The 23-year-old singer was looking happier and healthier than ever as she left the Hilton Hotel in New York City on Sunday night after performing at Hilary Clinton's 68th birthday party. more info

Perez Hilton — We love reunions! Nick Jonas and Demi Lovato are both on fire right now, which is why we couldn't be more excited for this! The Jonas brother just officially confirmed that the rumors are true — he will be touring with none other than Miz Lovato in... more info

Perez Hilton — As if Saturday night's We Can Survive concert in Hollywood didn't have enough big names! After performances by 5 Seconds of Summer, Demi Lovato, Nick Jonas, Sam Smith, Maroon 5, Calvin Harris, and The Weeknd, the well-sated crowd was treated to desse... more info

TMZ — Adam Lambert is cool as a cucumber on the outside, saying he's got no beef with Demi Lovato after she dumped him from her world tour for Nick Jonas.  Lambert took to Twitter Saturday, saying, "No beef tween Demi & Nick and me. Biz… more info

Perez Hilton — It's been a controversial 24 hours in pop music! Last night, we ran a story on the decision made by Demi Lovato to replace Adam Lambert on her concert tour with Nick Jonas, and sources indicated Lambert was MAD about the whole deal! Related: Demi Lov... more info

TMZ — Demi Lovato dropped Adam Lambert from her upcoming world-tour for Nick Jonas! Hear Harvey's take.  more info

TMZ — Nick Jonas was mum over Demi Lovato's decision to ax Adam Lambert on her tour and bring him along for the ride instead. TMZ broke the story, Adam and Demi had essentially struck a deal that he'd tour with her, but we're told Demi's manager -- who… ... more info

Perez Hilton — Fall Out Boy never ceases to surprise us. But in the BEST possible way. On Friday, the band announced they are re-releasing their chart-topping album American Beauty/American Psycho, but with a special twist! Video: FOB & Demi Lovato Team Up With Dou... more info

Perez Hilton — This is definitely NOT cool for the summer! According to sources, Adam Lambert was supposed to open for Demi Lovato on her soon-to-be-announced upcoming world tour. We are told that the songstress and the Ghost Town artist already hashed out details ... more info

TMZ — Demi Lovato unceremoniously dumped Adam Lambert as the opening act for her world tour, and is replacing him with Nick Jonas, TMZ has learned ... and Adam is real upset. Our sources say after Demi's people locked in Adam to join her on tour. It… ... more info