Lady Heather Mills McCartney is set to lose her title when she divorces Sir Paul McCartney. The animal rights activist received the prestigious title after marrying the former Beatle, who was knighted for his achievements in music in 1997. In accordance with British law, Heather, 38, would still be allowed to use the title if she keeps her husband’s surname. However, if the former model reverts back to her maiden name after the divorce, she will not be eligible to carry on calling herself Lady Heather. A source told Britain’s The Sun newspaper: “When a Sir gets divorced, his wife is allowed to use the title Lady but only if it is in the middle of her name. But if she reverts back to her maiden name, or remarries, then she will not be allowed to use Lady at all.”