MySQL Last Insert ID for MySQLi Object-Oriented

<?php
  $host = 'host';
  $user = 'user';
  $pass = 'pass';
  $db = 'db';
  // Create connection
  $conn = new mysqli($host, $user, $pass, $db);  	
  // Check connection  	
  if ($conn->connect_error) {      
    die("Failed to connect: " . $conn->connect_error);
  }
  $sql = "INSERT INTO users (username, password, email) VALUES ('Johny', 'Dawkins', '[email protected]')";  	
  if ($conn->query($sql) === TRUE) { 
    $latest_id = $conn->insert_id;    
    echo "Insert successful. Latest ID is: " . $latest_id;
  } else { 
    echo "Error: " . $sql . "<br>" . $conn->error;
  }
  $conn->close();  
?>