'Shahs of Sunset' Star -- All This Water... And I'm Still Thirsty!

Mercedes Javid paid homage to Denise Richards' character in 'Wild Things' by squeezing into a micro thong swimsuit for a very soapy and public car wash/cry-for-attention.

M.J. shamelessly posed while putting a shine on her Volkswagen SUV in L.A. -- even though the city's in the midst of severe drought.

She's been very open about her dramatic weight loss over the last year, which she chalks up to a healthy appetite for sex.

Still ... washing a car is a pain in the ass.