Troubled "Teen Mom 2" star Jenelle Evans got a new job ... a boob job.

One of the reality star's best friends tweeted a photo from inside the plastic surgeon's office this morning -- with the message "Ready to go and get new boobies!!!!"

About an hour ago, her buddy also tweeted "Jenelle is out of surgery and everything went great!"

While Jenelle hasn't said much about her decision to go under the knife, E! says she "got tired of having small breasts" and "decided on a full 'C' cup because she does not want to go too big."

We're guessing it's only a matter of time until she starts showing off her new figure on Twitter.

Stay tuned -- and see more stars who've had plastic surgery above!

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