Credit: Jason Squires/; Kevin Mazur/; Marc Piasecki/

Back in August 2007, Lady Gaga was a curvy brunette.

But through the years, the 25-year old pop star (real name: Stefani Germanotta) has evolved into a svelte, tiny blonde!

"It's all about starvation," Gaga told Us Weekly. "Pop stars don't eat."

She also told Sirius Morning Mash Up: "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 hung over if I am hung over."