Paul McCartney has written a song about his ongoing divorce battle with Heather Mills. The Beatles legend has consistently refused to comment about the former couple's current legal battles but is now set to reveal his true feelings about his estranged wife in a collaboration with a British musician.

McCartney, 65, has teamed up with Nitin Sawhney for a track on his forthcoming album London Undersound which is due for release later this year.

And Sawhney insists the song will be a shock to McCartney's fans.

He says, "Paul has done a track about how he feels about Heather and what was going on with the paparazzi because no one has heard his side of it at all - so this will be the first time anyone hears a song relating to that subject. It's very emotional and a very powerful song - not like anything that people are used to Paul McCartney doing."

Mills and McCartney - who split in May 2006 - are due to appear in court to continue negotiations over their divorce settlement in February.

-Paul McCartney Pictures
-Heather Mills Pictures

(This news article provided by World Entertainment News Network)