Sir Elton John has admitted that he is concerned over Lady Gaga's health as her busy schedule continues.

Gaga is currently on a massive world tour and Elton John told the Guardian that he often worries about her health.

He also said that the parents of Gaga, who is the godmother to Elton John and partner David Furnish's child Zachary, are also concerned about her workload. He said:

"I look at Gaga and I think, 'How does she do it?' I talk to her mum and dad about it. They worry."

He continued: "She is frail, and she doesn't eat when she should do, 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."