Conditional style on first row of ng-repeat

var app = angular.module('plunker', []);

app.controller('MainCtrl', function($scope) {
  $scope.stars = [   'vicky vette', 'ron jeremy', 'jenna jameson' ];
});

<!DOCTYPE html>
<html ng-app="plunker">

  <head>
    <meta charset="utf-8" />
    <title>AngularJS Plunker</title>
    <script>document.write('<base href="' + document.location + '" />');</script>
    <link rel="stylesheet" href="style.css" />
    <script data-require="angular.js@1.3.x" src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.3.7/angular.js" data-semver="1.3.7"></script>
    <script src="app.js"></script>
  </head>

  <body ng-controller="MainCtrl">
    <ul>
      <li ng-repeat="star in stars">

        <span ng-style="$first ? { 'color': 'red' } : {}">{{star}}</span>
        
      </li>
    </ul>
  </body>

</html>

/* Put your css in here */