Whether it's hanging at Coachella, partying or going to the beach - Selena regularly updates her Instagram page with pictures of friends Taylor Swift, Kylie and Kendall Jenner.
Indeed, the singer has been close to the two Kardashian sisters for years, and has cultivated a close bond with fellow songstress Taylor Swift.
But in a strange move today, Selena has deleted all trace of the aforementioned celebs from her Instagram page and unfollowed each of them.
So what exactly has gone on here, we wonder? Has the Spring Breakers star had an almighty fallout with her gal pals, and decided she no longer wants anything to do with them through social media? Or has she just been hacked?
Co-stars in her teen flick Spring Breakers seem to have escaped the photo cull - with a snap of Vanessa Hudgens and Ashley Benson still remaining.
Frankly, we're intrigued…