Megan Thee Stallion looks like she's about to rock the hell out of a Roberto Cavalli dress ... and she's giving everyone a sexy sneak preview.

The three-time Grammy Award-winning artist shared some photos from a recent dress fitting ... and she's got curves for days.

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Megan says she's getting fitted for a dress from the famous Italian fashion designer ... and it looks like she's pretty excited for the final product.

MTS is on an epic heater right now ... she recently celebrated her 31st birthday with a trip to a tropical location with her boyfriend, NBA baller Klay Thompson ... and her boo even got her a Bentley to boot.

Unclear what Megan needs the fancy dress for, but there's some more award shows on the horizon ... and whenever she wears it, she's going to turn some heads.

When it comes to Meg, it's clear hot girl summer never ended!!!