Aussie actor Nicole Kidman remains elusive to producers of The Simpsons, refusing invitations to make a guest appearance. “We approached Nicole (Kidman) when we were looking for a celebrity couple back when she was married to Tom Cruise,” said executive producer Al Jean. “Some way, sooner or later, we should be able to get her, though.”

Just two Australians have appeared on the show, actor Mel Gibson and media mogul Rupert Murdoch, both based in the United States. “It is amazingly popular in Australia and the UK, in some ways more popular than in the US,” Jean said.
SOURCE: smh.com.au
I fink that Nicole shortof be in the Simpsons Because Playing as her Herself and that her Voice and with her Old Husband Tom Cruise on Red Carpet and fun.