Selena Gomez -- I'm Making Hits, Not Hit-Boy, in Mexico

Selena Gomez's trip south of the border is strictly professional, meaning she's not banging Hit-Boy.

Selena caused quite the stir in that ugly bikini earlier this week, but less prominent was the famed producer who was by her side. Stories started surfacing that they were dating.

Our Selena sources say not true. They're recording an album at the home of Joe Francis, Casa Aramara, in Punta Mita.

Turns out Kanye and Kim went to Joe's house last year and he build a sick recording studio on the compound. Hit-Boy -- who's produced hits for Kanye, Jay Z, Chris Brown, Snoop, Bieber and many others -- heard the studio was gold and that's why he chose it for Selena.

There are extra perks ... an awesome beach, and even a sea lion that swims in Joe's pool.

BTW -- black bathing suit MUCH hotter.