You're talking about at least millions of people making billions of decisions. It's always going to have multiple factors. But evolution is almost always directly relevant, because it shaped our brain to the patterns it follows.

In this example, there are also plenty of external factors. The internet makes it possible to follow the behavior of celebrities. The celebrities have significant marketing teams actively trying to grab your interest (plus whatever businesses they're famous in relation to trying to piggy back). The fact that you don't have to spend 18 hours a day tracking prey just in case you manage to kill it. The fact that we're hugely biased to be interested in more attractive people, to find people we're exposed to more (especially in more glamorous lights) more attractive and most celebrities are also extremely attractive with professional teams to handle their appearance. The list always goes on.

But evolution is pretty much always a key lens to why we are what we are, because it actually is the why to almost all the low level behaviors that add up to big picture specific modern ones.