Bikini a Day Girls Wearing Bikinis Because Today Is a Day

8/10/2015 3:43 PM PDT

Instagram celebs Devin Brugman and Natasha Oakley -- better known as A Bikini A Day -- got their bikini action for Monday in Ibiza, Spain ... giving us a glimpse of how the magic happens.

These girls are much more popular than Oversized Turtleneck Sweater A Day ... those chicks are struggling to find an audience.