Miley Cyrus’ secret new music video is so sexy … she and her DJ friend had to hire a smoking hot PORN STAR to do the job right — TMZ has learned.The video was shot a couple weeks ago at Beacher’s Madhouse in Hollywood — for Miley’s new song “Decisions” with Israeli DJ Borgore.Sources close to production tell TMZ, the song’s about 20-year-old porn star Jessie Andrews — who used to date Borgore — so Miley and Borgore asked Jessie to star in it.

Jessie — who won this year’s AVN Award for Best Actress — happily obliged, and we’re told the entire video went off without a hitch. FYI, the pic was taken the night of filming, and shows the dress Jessie wore in the video.

And since the entire thing was filmed at Beacher’s — we’re told you can expect a music video filled with little people, a unicorn, a goat, and a woman with watermelon-smashing boobs. It’s due out later this week. Oh yeah, Miley’s in it too.

Source TMZ