LOS ANGELES (Reuters) - Elvis Presley and The Beatles top the list of most-forged celebrity signatures in 2012, with less than half of their autographs for sale certified as genuine, memorabilia authenticators PSA/DNA said on Thursday. The King and The Fab Four British rockers, who topped the list two years ago when it was last released, joined notable figures such as former U.S. President John F. Kennedy and late pop star Michael Jackson on the list of most-forged celebrity signatures. Late American astronaut Neil Armstrong landed at No. ...