MySQLの左結合で関連付けられた行の数を取得するにはどうすればよいですか？

SELECT 
    `vehicle`.`id`, 
    `vehicle`.`stock`, 
    `vehicle`.`year`, 
    `vehicle`.`make`, 
    `vehicle`.`model`, 
    `images`.`name`,
    (
        SELECT COUNT(*) 
        FROM `images` 
        WHERE `vehicle_id` = `vehicle`.`id`
    ) AS `image_count`
FROM `vehicle`
LEFT JOIN `images`
ON `images`.`vehicle_id` = `vehicle`.`id`
WHERE `images`.`default`