add_reviews_to_frontpage

/ Hook our custom function to the pre_get_posts action hook
add_action( 'pre_get_posts', 'add_reviews_to_frontpage' );
 
// Alter the main query
function add_reviews_to_frontpage( $query ) {
    if ( is_home() && $query->is_main_query() ) {
        $query->set( 'post_type', array( 'post', 'movie', 'review' ) );
    }
    return $query;
}