Selena Gomez has turned her back on former BFFs Kendall and Kylie Jenner because she wants to focus on what's really important -- MUSIC -- and thinks the Jenners are nothing but a toxic distraction ... sources tell TMZ.
Sources close to Selena tell us, the singer had an epiphany after Coachella last week -- where she was surrounded by booze and drugs while hanging with the Jenner girls, Justin Bieber ... and all the hangers-on that come with them.
We're told Selena's sick of that scene -- so she's decided to cut out what she considers the biggest sources of negativity ... Jenner girls included.
The Insta-purge continued ... with Bieber and a bunch of others getting dropped -- and, in fact, she's currently following ZERO people.
We're told Selena is determined to stay on the straight and narrow -- focusing on music and, get this ... going to church almost daily.
Makes ya think ... must've been one helluva party at Coachella.
Credit Tmz