Lady Gaga joins Adam Lambert and Queen onstage in Sydney – watch
The singer joined the group for a rendition of 'Another One Bites the Dust' in Australia
Lady Gaga and Tony Bennett release duet ahead of new collaboration album
Upcoming record 'Cheek to Cheek' will feature a variety of jazz standards
Lady Gaga appears as waitress in new 'Sin City' trailer – watch
Singer says director Robert Rodriguez 'really killed this one'
Lady Gaga's former personal assistant to write memoir
Jennifer O'Neill to publish 'tell-all' 'Fame Monster' book
Teenage metal band to support Lady Gaga on US tour dates
Babymetal will join the pop star on five dates Stateside this summer
Lady Gaga and Tony Bennett make surprise appearance at New York school
Students at the Frank Sinatra School of the Arts were treated to a performance and masterclass on their last day of term
Lady Gaga cancels two US shows after being diagnosed with bronchitis
Seattle and Vancouver shows affected by illness
Lady Gaga adds four dates to UK leg of ArtRAVE tour - O2 Priority Ticket Details
Extra dates in Birmingham, Sheffield, Newcastle and Glasgow announced
Lady Gaga reveals artRAVE tour setlist
Singer shares picture online of upcoming tour's running order
Lady Gaga admits using facelift tape every day
'Looking artificial can be honest,' says the 'ARTPOP' singer