Rihanna is running out of real estate on her body -- as she got yet another tattoo!

The singer, who has at least 16 other tattoos, got inked up again ... this time on her ankle.

RiRi took to Twitter this weekend to show off her new art, a black and white tribal falcon.

"Falcon: a light that shines in the darkness! Never close their eyes during sleep," she wrote about her new permanent beauty mark.

Rihanna's other tattoos include stars on her neck, a gun on her ribcage, music notes on her feet and the word "Love" on her finger.

See 'em all in the gallery above!

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