function wc_change_new_order_email_recipient($recipient, $order) {
        global $woocommerce;
        $user = $order->get_user();
        $recipient[] = $user->user_email;

        return $recipient;
    }

    add_filter('woocommerce_email_recipient_new_order', 'wc_change_new_order_email_recipient', 10, 2);