Bella Hadid pulled out all the sexy stops when she teased a secret new project that she's posing for -- and she looks sexy AF in it.

In the photo, the 19-year-old has a curly faux bob and is wearing only a teeny tiny black thong, along with a sparkly body chain and choker.

Along with the racy snap, Bella wrote, “💥💥Sorry mama 😇 Secret project with my dream team @nomadrj and @elizabethsulcer 😻😻😈😇😇 #BTS”

We have a feeling the Real Housewives of Beverly Hills star isn't going to mind -- that fame-seeking lady has been milking her looks for ages!

And in case you were wondering about what Bella's taking it all off for -- we're thinking that looking at her dream team's credentials that she's most likely doing a shoot for an international edition of Vogue.

Oh la la!