What is the collective noun for pop-stars?

There isn't a widely recognized collective noun specifically for pop stars. However, you could use some general terms that would fit the situation:

* A galaxy of pop stars

* A constellation of pop stars

* A throng of pop stars

* A bevy of pop stars

* A crew of pop stars

* A cast of pop stars

You could also be more playful and use:

* A glitter bomb of pop stars

* A mic drop of pop stars

* A chart-topper of pop stars

Ultimately, the best choice depends on the context and the specific tone you want to convey.