Hot Tub High School is a low-budget movie, in which a young Chloe Decker appeared topless.
In "Pilot", Lucifer remembers seeing Chloe in the movie.
In "Everything's Coming Up Lucifer", Lucifer mention's movie title to Chloe.
In "My Little Monkey", (aired 11/07/16 to "Petey" - the Asian shop keeper) Chloe's father mentions the film after giving tickets to Petey. He refers to her as "My Little Monkey" and says he's proud of her and to say it was good after the "funny business" about ten minutes in.