Is Lady Gaga pregnant or just partying too much?!

Lady Gaga is said to have gained more than TWO STONE as she parties her way round the world on tour.

The Poker Face singer flaunted a noticeably fuller figure on stage in Amsterdam this week.

She bulged out of skimpy fishnet tights – and showed far more meat on her bones in her infamous flesh dress.

And experts are suggesting that she has piled on the pounds through her love of booze.

“Gaga appears to have gained at least 30 pounds,” nutritionist Majid Ali said after seeing photos of the 26-year-old.

The star has said in the past that she shuns food in favour of the “drunk diet” and Ali thinks alcohol is the likely cause of her weight gain.

Gaga said in February 2011: “I am on the drunk diet. I like to drink whiskey and stuff while I am working.

“But the deal is I’ve got to work out every day, and I work out hungover if I am hungover.”

The star drew criticism earlier this year for implying she starves herself to say slim, tweeting: “Eating a salad dreaming of a cheeseburger. Pop singers don’t eat. I was born this way.”

Of course, one star pal has a different theory behind Gaga’s extra pounds.

Kelly Osbourne told Alan Carr’s Chatty Man show that she thinks the singer is PREGNANT.