Singer has been watching Jennifer Aniston’s ex on DVD

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Lily Allen is a huge fan of John Mayer.

The singer, 23, thinks the US rocker is a brilliant musician and really hot.

I think Im in love with John Mayer, Lily writes on her Twitter account. I watched a DVD of one of his concerts.

His guitar playing is mesmerising. Sexy.

John, 31, split from Jennifer Aniston, 40, shortly after the Oscars in February.

SEE PICTURES Jennifer Aniston – lonely at 40>>

John Mayer May 2008