Sydney Leathers -- Anthony Weiner's Sexting Partner Strips Naked in Hardcore Porn [PHOTOS]

Ladies and gentlemen, prepare for an epic shock -- Anthony Weiner's sexting partner Sydney Leathers has filmed a hardcore masturbation porn ... and TMZ has some pics from the shoot.

Yeah, we saw it coming -- Sydney paid a visit to Vivid porn HQ in L.A. just days ago ... and Vivid's fearless leader, Steve Hirsch, isn't one to waste time.

We've seen the flick, so we'll paint you a picture. Leathers gets naked, strikes a bunch of stereotypical porn poses, and away she goes ... strumming the old banjo.

It's unclear how much Sydney got paid.

Most people think Sydney wasn't hot enough for Weiner to risk his political career -- so, as for her new porn, we gotta ask ...