Rihanna's got nothing to hide!

The sexy singer is revealing a lot about herself today -- like how she looks without makeup and if she can actually act.

RiRi tweeted some fresh-face photos of herself last night on Twitter, posting four different shots of her looking gorgeous while wearing very minimal makeup. See the other three in the gallery above.

Universal has also released a ton of new clips from Rihanna's upcoming film "Battleship" -- including three where we see her in action as naval officer Raikes.

We cut the clips together below ... how do you think she did? Check out more when the movie opens May 18!