British singer/songwriter Sir Elton John, who recently had a health scare (a respiratory infection) that forced him to cancel concerts in Las Vegas, has voiced his concerns over the health of pop/dance sensation Lady Gaga. The 65 year old singer feels Gaga is "frail" and undernourished as a result of her tiresome and hectic tour schedules. According to John, the 26 year old singer's parents are also quite worried about her health.

"I look at Gaga, and I think, 'How does she do it?' I talk to her mum and dad about it. They worry," John told the Guardian in an interview.

John has reasons to have concerns for Gaga's health because the 26 year old singer had had some serious problems in the past.

The Poker Face hitmaker was forced to cancel a show in West Lafayette (Indiana) in early 2010 after she experienced problems including rapid heartbeat and shortness of breath just minutes before the concert. In another incident, the Born This Way singer nearly fainted during a performance in Auckland, New Zealand.

"She is frail, and she doesn't eat when she should do, and she's a girl, and it's tougher for a girl," the Rolling Stone magazine quoted the Candle in the Wind hitmaker as saying.

"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," he aded, according to MTV news.

Gaga, who is very close to the 65 year old singer, is the godmother of John's son, Zachary. In addition, the duo have collaborated musically on several ocassions, including a duet on Hello Hello (a soundtrack for the 2011 animated film Gnomeo and Juliet).

According to Gaga, the pair will return to the studios to record a duet for her next album; the album is being planned as the singer works on her Born This Way tour.

"My next duet, I believe, will be with Elton. I'm already working on my next album, and I played him a song that I wrote, and he really loved it. I don't want to give anything [else] away!" Gaga had told British talk-show host Alan Carr in an interview last year, according to MTV news.