jquery loop on Json data using $.each

Hi I have the following JSON returned in a variable called data.

THIS IS THE JSON THAT GETS RETURNED...

[ 
{"Id": 10004, "PageName": "club"}, 
{"Id": 10040, "PageName": "qaz"}, 
{"Id": 10059, "PageName": "jjjjjjj"}
]

and I am trying to loop through the collection using $.each but I am running into problems where the alert is showing undefined. I have tried alot of different syntax but can‘t seem to figure this out.

The JQuery I am using is

$.each(data, function(i, item) {
    alert(item.PageName);
});

Can any one point me in the right direction?

EDIT This is the code I am using to grab the data

$.getJSON(‘/Cms/GetPages/123‘, null, function(data) {
  fillSelect(data);
});

and this is the function that gets called upon call back

function fillSelect(data) {
  alert(data);
  $.each(data, function(i, item) {
    alert(item.PageName);
  });
}

EDIT 2 This is slightly confusing me, according to the docs it should work as I have it, but it doesn‘t. According to fiddler the header shows:-

Content-Type: application/json; charset=utf-8

and the JSON is exactly correct above. I am using chrome if this makes any different. Will test in IE and FF....

EDIT 3

using $.get produces

"[\r\n {\r\n \"Id\": 10041,\r\n \"PageName\": \"01234567890\",\r\n \"MetaId\": 1000,\r\n \"TemplateId\": 2\r\n },\r\n {\r\n \"Id\": 10001,\r\n \"PageName\": \"about\",\r\n \"MetaId\": 1000,\r\n \"TemplateId\": 1\r\n },\r\n {\r\n \"Id\": 10056,\r\n \"PageName\": \"fdgdfgdfg\",\r\n \"MetaId\": 1000,\r\n \"TemplateId\": 1\r\n },\r\n {\r\n \"Id\": 10052,\r\n \"PageName\": \"hjkhjk\",\r\n \"MetaId\": 1000,\r\n \"TemplateId\": 2\r\n },\r\n {\r\n \"Id\": 10059,\r\n \"PageName\": \"jjjjjjj\",\r\n \"MetaId\": 1000,\r\n \"TemplateId\": 1\r\n },\r\n {\r\n \"Id\": 10057,\r\n \"PageName\": \"qqqqq\",\r\n \"MetaId\": 1000,\r\n \"TemplateId\": 2\r\n },\r\n {\r\n \"Id\": 10054,\r\n \"PageName\": \"qwqw\",\r\n \"MetaId\": 1000,\r\n \"TemplateId\": 2\r\n }\r\n]"