Recent photos show Madonna looking gaunt, but her trainer tells CelebTV.com that the singer is perfectly healthy and is "doing it right."

Joel Harper, a New-York based celebrity trainer and former model, told the Web site that “if she appears to be gaunt, it’s really just that she’s muscular and ripped — she’s a powerhouse. She has to keep up her rigorous touring schedule.”

He added that the singer, who turns 50 next week, is "spot on" with her workout program — "just take a look at her, she’s doing it right," said Harper.

The pop star released her 11th album, titled "Hard Candy," earlier this year. Her "Sticky and Sweet" world concert tour begins this month in Cardiff, Wales, making stops in European cities like London and Paris before beginning its U.S. leg Oct. 3 in East Rutherford, N.J.

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