Anna Nicole Smith attacked singer and actress Jessica Simpson through an ironic column in National Enquirer, warning her she will get revenge, for saying she can't be compared to Smith.

Anna Nicole, 38, also challenged Simpson to take an IQ test live on TV, because there is no way she has an IQ of 160.

Smith writes: "I heard that Jessica Simpson is running her mouth again about not wanting to be compared to me. Well I've got news for you, honey - the feeling is mutual.

"Let's see how you react when the media turns on you - and they will! You'll be lucky if they compare you to Pam Anderson!

"Oh, and what's this about you supposedly having an IQ of 160? Please! You should take an IQ test on live TV."