Heeee's baaaack! Justin Bieber's back in LA and back to his daily hikes ... with hot girls!

Bieber, 23, cleaned up his act during his Promise tour, at the advice of his pastor Carl Lentz, and part of his routine was working out daily. When he's in Los Angeles, one of his favorite workouts is a good hiking and he usually brings a cute girl with him -- this time, Selena look alike model Audreyana Michelle.

The 17-year-old brunette has more than 300K Instagram followers and has modeled at least twice for the Kardashian family -- for Khloe's Good American bodysuits AND for Kylie's cosmetics line. Perhaps the Kardashian girls set them up? #KardashianCupids ... it's a cute couple, that's for sure!