Lady Gaga gained 25 pounds ... and she's blaming it on Italian food.

She said: "I'm dieting right now, because I gained 25 pounds. And you know I really don't feel bad about it, not even for a second. I have to be on such a strict diet constantly. It's hard because it's a quite vigorous show, so I tend to bulk up, get muscular, and I really don't like that. So I'm trying to find a new balance."

Sources have said the weight gain is because of Gaga drinking and smoking marijuana.

but, She said: "I love eating pasta and pizza. 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 in 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."