Jenelle Evans is slamming online gossip -- and using a sexy bikini photo to do it!

The "Teen Mom 2" star, who recently went under the knife for a boob job, showed off her new purchases in a racy TwitPic ... where she also fought off rumors she was knocked up again and/or gaining weight.

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"No I'm not pregnant," she tweeted earlier this week. "No I'm not fat. Check out my new bathing suit. :) I love it. SO BRIGHT!"

The only true new piece of news about her: She is engaged to boyfriend Gary Head.

Check out her engagement ring here.
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