Sir Elton John arrives to the auction following the Revlon concert for The Rainforest Fund at The Pierre Hotel on April 3, 2012 in New York City. Credit: Dimitrios Kambouris/

Lady Gaga's health has Elton John concerned.

In a new interview with The Guardian, John, 65, said he's worried about the 26-year-old singer. 

"I look at Gaga and I think, 'How does she do it?' I talk to her mom and dad about it," the music legend said. "They worry." 

"She is frail, and she doesn't eat when she should, and she's a girl, and it's tougher for a girl," John explained. "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."

In April 2011, John revealed on Good Morning America that Gaga is the godmother of his 12-month-old son, Zachary Jackson, with husband David Furnish. "When you get to the real person under there, there's a real simple person under there who loves her parents," he said of Gaga.

John suffered his own health scare recently. On May 23 he was hospitalized with a "serious" respiratory infection. The music legend had to cancel shows in Las Vegas to recover from the illness. "All I can say to the fans is sorry I can't be with you," he said in a statement. "I hope to see you soon at this wonderful theatre at Caesars Palace."