Singer-turned-TV star Cilla Black is convinced she should have warned her friend Sir Paul McCartney against marrying his now estranged wife Heather Mills. The veteran entertainer is sure the Beatles legend rushed into his marriage to Mills because he was still grieving for his first wife Linda - who died of breast cancer in 1998. Black, 64, was wary about the union but resisted offering MCCartney her opinion on Mills because she feared he wouldn't heed her advice. She says, "If you're totally besotted with somebody - as Paul was with Heather - you don't want a third party telling you what to do. "I do advise most of my friends. But not Paul. Mind you, if he'd asked I'd have said what I thought. I'd have told him he had to make his own mistakes. That's the only way you learn. "But I might have suggested (to Paul) that perhaps he should listen to what his family were saying." Mills and MCCartney - who split in May 2006 after four years of marriage - are currently locked in a bitter divorce battle and are due to appear in court to continue negotiations in February (08).