Katy Perry's girls are so famously ample, they were spoofed on Saturday Night Live and even Ellen DeGeneres couldn't stop gawking at them.

Ellen got a good peek when Katy wore a revealing green dress to the 2013 Grammys. Apparently Katy’s Grammys look got people speculating that maybe she had augmented the goods. But RumorFix talked to a source close to Katy, who said, "No she didn’t have a boob job. It was that dress — it pushed her breasts out!”

A couple of years ago, Katy talked about wanting to reduce her breast size when she was 13. "I had really bad back problems and was a little bit thicker,” she said (via Showbiz Spy). “Then I grew up and lost the baby fat and said, ‘Hey, this isn’t all that bad.’ ”

Not bad at all. John Mayer probably agrees, too.

Sources: RumorFix, Showbiz Spy