London, Jan 6 : English singer/songwriter Lily Allen has reignited the feud she had with US singer Katy Perry by threatening to post the `I Kissed A Girl' singer's mobile number on the web.

The two have been at each other's throat ever since Perry called Allen fat, and now the `Smile' singer, who called Perry `crass', has threatened to post her number on the net should she make any more comments.

"I have Katy Perry's number, someone did me a favour," the Sun quoted Allen as having written on her Facebook page.

"I'm just waiting for her to open her mouth one more time then it hits Facebook," she had added.

Allen, 23, has also joined two groups on the networking site that are against Perry, 24.

One is called "I hate Katy Perry and her dumb-ass song I Kissed A Girl".

The other is "Katy Perry? Who in the hell does she think she is?" (ANI)