is there any api to get album art from spotify?

Question

Possible Duplicate:
Retrieve cover artwork using Spotify API

is there any api to get album art from spotify?

I m trying to retrieve details on the album via

$url_id = "some_spotify_album_id";
http://ws.spotify.com/lookup/1/?uri=spotify:album:$url_id";

I m getting the album name, artist name etc using the above api. But its not returning the album art.

Pls help, Thanks