Courtney Stodden got down and dirty — literally — letting herself get drenched in corn syrup to protest the leather industry, in support of PETA.

Check it out — Courtney stripped down to a bikini on Hollywood Boulevard on Thursday before the sticky black syrup was dramatically poured all over her … telling TMZ later the messy stunt was still nothing compared to what cows endure.

Courtney made it clear she’s calling out what she sees as the leather industry’s dirtiest secret — saying she’s all about exposing the ugly side of luxury fashion, even if it means pulling a wild stunt like this.