Lorde -- Porn Awards Want To See What Dat Mouth Do

Lorde's innocent flirting with porn star, James Deen, could land her deep in the sex-on-cam biz -- the porn industry wants her for a gig at their award show.

Porn sources tell TMZ ... Adult Video News (AVN) sent an enticing email to the singer inviting her to open wide ... and sing for the AVNs (the porn Oscars) in Vegas next month.

Back in November, Deen and Lorde safely exchanged mutual love -- on Twitter -- which AVN believes is a strong enough connection for her to perform at the show.

No word on whether she'll accept the invite, but AVN is convinced her “passion for a good story” makes her a perfect fit.

Barely legal bonus: Lorde just turned 18.