how to? – wp_insert_post only to a custom post type

Hi,
I’m trying to insert a post using wp_insert_post to my custom post type, say ‘review’. I set ‘post_type’ to ‘reviews’ as follows:

$post = array(
                 //skipping the rest
                'post_author' => 'someone'
		'post_type'=> 'reviews',
                'post_category'=>array('1234')
		);

It inserts the post to my custom post type, but also inserts it to the regular posts with title ‘(no title), category as some random category and the author as ‘admin’. I just want to insert the post to my custom post type ‘reviews’.

Please tell me how to do it!

Thanks for any help in advance!