Sir Paul McCartney is furious with the media's treatment of his estranged wife Heather Mills in the light of her alleged former career in "porn". It was reported in British newspaper The Sun this week (begs05JUN06) that the animal rights campaigner had posed in "pornographic" German book DIE FREUDEN DER LIEBE (THE JOYS OF LOVE) in 1988. But the former beatle insists his relationship with Mills remains "very amicable", and claims the media backlash sparked by the revelations is simply "cruel". He tells a friend, "I can't believe the cruelty towards her. Heather has been and will continue to be an important part of my life. There's nothing in her past I don't know about. Nothing." The rocker's spokesperson confirms, "Paul and Heather are still speaking and it's very amicable." MCCartney and Mills - who gave birth to their baby BEATRICE in 2003 - split last month (MAY06) after four years of marriage.