Gwyneth Paltrow has got everyone wondering who her 'frenemy' is after hitting out an unnamed former friend in her latest online newletter.

The actress posted a cryptic message on her Goop website, referring to an ex-pal who suffered a fall after turning against her.

She writes:

Back in the day, I had a "frenemy" who, as it turned out, was pretty hellbent on taking me down. This person really did what they could to hurt me. I was deept upset, I was angry, I was all of those things you feel when you find out that someone you thought you liked was venomous and dangerous. I restained myself from fighting back. I tried to take the high road. But one day I heard that something unfortunate and humiliating had happened to this person. And my reaction was deep relief and… happiness. There went the high road. So, why does it feel so good to hear something bad about someone you don't like? Or someone you DO like? Or someone you don't KNOW? I once asked the editor of a tabloid newspaper why all of the stories about a famous British couple had a negative bent. He said that when the headline was positive, the paper didn't sell. Why is that? What's wrong with us? I asked the sages to shed a little light.
Here's to washing our mouths out with soap...
Love,
Gwyneth

There's speculation that the actress is talking about one-time pal Winona Ryder.

The pair were bosom buddies until Gwyneth reportedly stole her Oscar-winning Shakespeare in Love role from her fellow actress.

Winona suffered a humiliating experience shortly after when she was arrested for shoplifting in 2001.

Check out Gwynnie's Oscar-winning style below