Lady Gaga is about to perform three stadium shows in Auckland, but Sir Elton John says the chart-stopping pop star isn't up to it.
The Rocket Man singer, 65, is concerned about the 26-year-old singer's health - and the toll all her touring is taking on her tiny frame.
He told The Guardian: "I look at GaGa and I think, 'How does she do it?'
"She is frail, and she doesn't eat when she should, and she's a girl, and it's tougher for a girl. She works really hard. She will be in Denmark one night and Saudi Arabia the next.
"I know how tiny she is and I do worry about her, yes."