How do you help your girlfriend get over her insecurities?

My girlfriend isn't even fat or chubby, but just has some belly fat on her stomach that I find pretty attractive. She doesn't believe me when I say I find her stomach attractive and she doesn't like anyone to touch it whatsoever or even mention it. How do you think I can help her become more comfortable in her skin?
How do you help your girlfriend get over her insecurities?
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