Lady Gaga performs in Paris during a stop on her Monster's Ball Tour. WENN.COM

Outrageous pop star Lady Gaga has sparked more controversy - she stays slim by following the "drunk diet".

The Poker Face hitmaker often shows off her toned physique in a series of sexy stage outfits but insists she would never cut out alcohol in a bid to lose weight.

Gaga admits her slim frame is down to exercise and her boyfriend Luc Carl's "drunk diet", which saw him lose 40 pounds (18 kilograms) while still partying hard.

She tells Sirius XM, "I am on the drunk diet. I live my life as I want to, and creatively. I like to drink whiskey and stuff while I am working.

"The deal is, I've got to work out every day, and I work out hungover if I am hungover. And it's about the cross-training and keeping yourself inspired. I have to say, I do a ton of yoga."

Carl is currently working on a book entitled The Drunk Diet, about his nontraditional weight loss method.