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The fit-again Fame Monster, who last week staged her first gig since hip surgery in February, had New York fans swooning over her performance.

But she also left her musicians and backstage staff gagging over the fumes from her never-ending flatulence.

One member of her crew at the Gay Pride rally revealed: “The smell was foul, like a dumpster full of rotting food. And some of her farts were loud, so there was no pretending she wasn’t the source of the stench.

“It was especially bad every time she bent over to change costume or made a vigorous move on stage. A fresh one would come cracking out but she’d just laugh when people held their noses.”

Gassy Gaga, 27, blames a new diet that has helped her lose 2st 1lb since her surgery.

But a source close – but not too close – to the Born This Way singer confided: “The real problem is she has been trying to crash diet by making modifications to the one her nutritionist and trainer devised for her.

“Instead of following it to the letter, she spent a week eating hard-boiled eggs and another eating only spinach. Whose stomach and intestines wouldn’t be in turmoil?”

Gaga’s pal added: “It’s gotten so bad it’s beyond a joke. The eggs-only week was especially bad and a vapour trail of sulphur followed in her wake.

“She thinks it’s a hoot, especially when she drops a string of them, it seems to go on forever. It’s the silent ones that creep up on you that are the worst.

“Nobody dares complain. She saw one costume girl holding her nose and sniffed, ‘What’s your problem?’ The poor girl was struck dumb and Gaga walked by giggling.”

The outlandish singer, who had her post-surgery wheelchair customised into a gold-plated “throne”, couldn’t even contain herself during a speech she gave at last week’s gig to celebrate the US Supreme Court’s decision in favour of gay marriage.

One observer claimed: “The mike picked up several farts, despite the fact the crowd was noisy. But she carried on regardless. It was surreal.”

Sporting her blonde locks in a bob, Gaga waved a gay pride rainbow flag as she told the crowd on Manhattan’s Pier 26: “We are not a niche. We are part – a big, giant part – of humanity.

“It’s time for us to be mainstream. I demand the rights!” She then sang an a capella version of The Star Spangled Banner.

Gaga’s spokeswoman refused to comment on her flatulence, insisting: “That will not be graced with an answer.”

But a road crew member declared: “Everyone is holding their breath and hoping she’ll return to a normal diet soon.”