By Debbie Emery - Breaking Celebrity News Reporter

Miley Cyrus' eye-popping cleavage at Sunday's CNN's Heroes 2011 awards event prompted speculation from numerous surgeons that she has gotten breast implants, and now the teenage singer is responding on Twitter, claiming she is all natural.

"Thank you for the compliment but these babies are all mine. I wish they'd realize you don't have to be fake to be beautiful!" the 19-year-old Hannah Montana star tweeted on Tuesday.

The comment was a response to comments made to Star magazine by three different plastic surgery experts who believe she has actually gone under the knife to boost her bust after she turned heads as she walked the red carpet in a yellow Roberto Cavalli dress with her boyfriend, Liam Hemsworth.

"Her breasts are very nice and round and it looks like she has had them done," said cosmetic physician Dr. Tahl Humes of Vitahl Medical Aesthetics in Colorado. "If you look at the volume, it appears she has had a breast augmentation.