Rihanna is following in Megan Fox's sexy footsteps -- and is taking it off for Armani Underwear.

The sexy singer is the latest to pose for the brand, showing off her incredible body in a series of just-released photos.

Wearing lingerie, jeans and a blonde wig, RiRi looks amazing ... shocker, right?

Megan Fox and Victoria Beckham previously modeled for the designer.

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