In his latest collaboration with the extreme animal-rights group, recording artist Paul McCartney is endorsing a campaign run by People for the Ethical Treatment of Animals (PETA); the effort is aimed at getting British schoolchildren to stop drinking milk. According to the New York Post, McCartney will host a fund-raising party for PETA this coming weekend, along with other Nanny-celebs Pamela Anderson, Oliver Stone, and Ringo Starr.