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Beverly Hills plastic surgeon Frank Ryan recently performed 10 procedures on Heidi Montag, ranging from breast implants to a brow lift to fat injections in her cheeks.

Now he tells he won't operate on The Hills star, 23, again.

"There’s really nothing to do!" he told Us Tuesday at the Anastasia Beverly Hills Lights Camera Fashion Pre-Oscar Party. "I told Heidi that, 'What are you going to do? You’re done!'"

(Montag recently told Us she didn't get her DDD breasts "as big as I originally wanted!")

Ryan -- who also performed Montag's nose job and breast augmentation in 2007-- told Us that some of Montag's peers have "definitely" called up and made similar surgery requests.

"In the reality [TV] world, there’s a lot of competition and there’s a lot of possessiveness for one’s doctor," he told Us. "It’s pretty interesting."