Lady Gaga Reportedly Living on Baby Food: Which Celeb Has the Most Extreme Diet?

Feb. 2011: Lady Gaga (X17online.com)

We've all seen enough of Lady Gaga's nearly naked body to know that she's in pretty good shape.

So how does she get that way?

Well, shaking what your mama gave you every night on a 200-performance international world tour certainly helps. But Gaga is also supposedly on the "goo diet," in which she eats infant puree instead of grown-up meals.

SODAHEAD SLIDESHOW: See the celebrities with the most extreme diets. 

"She's not eating healthily at all. She's substituting meals for jars of baby food," a source told Heat magazine.

From Lady GooGoo to Beyonce to Oprah, let us know: Which celeb diet is the most extreme?

Click here for more Gaga photos from X17 Online.