Lady GaGa has suffered with eating disorders since she was 15.

The 'Judas' singer - who recently confessed to gaining 25 lbs in weight - posted a picture of herself in her underwear on website littlemonsters.com with a caption revealing she has had body issues since she was a teenager.

She wrote: ''Bulimia and anorexia since I was 15.''

Fans on the site immediately heaped praise on the singer, with user Ida writing: ''I can't stop crying. Gaga I'm battling the same thing right now.''

Fellow fan Dylan Appleby added: ''to be perfectly honest i don't see the weight gain and even if i could it doesn't matter (sic)''

Lady Gaga recently revealed the reason behind her weight increase was down to her father's restaurant in New York.

She said: ''I love eating pasta and I'm a New York Italian girl. That's why I have been staying out of New York.

''My father opened a restaurant. It's so amazing ... it's so freaking delicious, but I'm telling you I gain five pounds every time I go there.

''So my dad wants me to eat at the restaurant, and I'm like, 'I've got to go where I can drink green juice.' ''