JQuery :: Parse A JSON Response Array?

How can I adequately parse a JSON response I'm getting from the server, which happens to be an array?

The array I'm getting back is actually this one:

[{"photo":{"created_at":"2011-02-26T18:40:00Z","id":5,"name":"Natalie_Portman.jpg","updated_at":"2011-02-26T18:40:00Z"}},{"photo":{"created_at":"2011-02-26T18:40:14Z","id":6,"name":"scarlett-johansson-.jpg","updated_at":"2011-02-26T18:40:14Z"}}]

I believe this one is valid JSON, but my attempts to parse it are always failing when I do it like this:

success:
function(data, textStatus, xhr)
{
var photos = jQuery.parseJSON(data);
alert(photos);
},

The above code displays 'null', and the documentation says a null occurs when the JSON isn't valid. so, what's going on ?

I need to know the codes to parse as well as access the values in the parsed response.