Heather Mills Launches Pro-Vegan Campaign With Racy Ads Monday , November 19, 2007 Substitute rat's milk for cow's milk and you will help save the world. At least, that’s what Heather Mills believes. The 39-year-old former model turned activist turned estranged wife of Paul McCartney launched a pro-vegan campaign Monday in Hyde Park, in England. Animal charity Viva! features Mills on two huge traffic-stopping billboards and a series of ads that advocate the reduced consumption of dairy and livestock. "The startling truth is that animals farmed for meat and dairy are now one of the greatest threats to the planet,”...