Among the disclosures at the Brooke Astor trial yesterday: the socialite's mental state had decline to the point where she once walked around her Maine mansion completely naked, a maid testified. Astor's son, Anthony Marshall, is charged with swindling millions from her estate while she suffered from Alzheimer's disease before her death at the age of 105 in 2007. The maid, Carol Stanley, was one of the prosecution's witnesses called to testify about Astor's condition. Stanley recalled that Astor once asked her, "What's my name? I don't know what it is. Who am I?" The trial, now in its fourth week, also included testimony from Vanity Fair editor Graydon Carter yesterday, who said, "She was probably the most beautifully turned-out woman I've ever seen."