Demi Lovato opens up about bipolar disorder Teen Choice Awards: Winners round-up Sam Smith reaches new US Hot 100 peak Demi Lovato in marriage equality video The Vamps react to YouTube comments Justice Crew break Aussie chart record Demi Lovato: 'Nobody knows Miley Cyrus' Frozen biggest soundtrack since Mamma Mia! Lovato stands up for gay rights in new video Demi Lovato slams paparazzi 'bullies' Demi Lovato on past: 'I can't be fixed' Ella Henderson retains No.1 single Who will be No. 1 on Sunday's charts? Ed Sheeran: I still read all my reviews Watch The Vamps, Demi Lovato's new video Enrique, Demi Lovato for joint UK tour Demi Lovato excited for Ed Sheeran collab See Demi Lovato's KOKO show setlist Little Mix: 'Album No.3 is proving hard' The Vamps talk Demi Lovato collaboration Listen to Vamps, Demi Lovato's new song Demi Lovato surprises fans in new video Demi Lovato announces new single Demi Lovato talks bipolar battle Who's on Demi Lovato's collaboration list? Demi Lovato announces crowd-sourced tour Radio Disney Music Awards 2014: Who won? Little Mix announce first US tour Lovato London show sells out in seconds Demi Lovato to play one-off London show What Grand National? 7 ridiculous celeb bets Frozen: Idina Menzel scores US chart peak Lady Gaga: 'Being vomited on is pure art' Watch Demi prank Little Mix on stage Gaga petition: Stop glamorising bulimia Lady Gaga song leaks online - listen Lady Gaga: 'I was bankrupt in 2009' Gaga artist responds to Lovato criticism Lady Gaga's SXSW set: was it art? Lovato slams Gaga's 'eat disorder art'