The television show "Entertainment Tonight" has won the rights to the planned May wedding of Mary Kay Letourneau and her former sixth-grade pupil Vili Fualaau, the father of her two youngest children. ET and its sister show, "The Insider," planned to begin offering the first in a series of interviews with the couple Thursday. The date and location of the wedding have not yet been disclosed. Letourneau, 43, served 7 1/2 years in prison after she was convicted of raping Fualaau, 22. She was released last August. The couple first met when he was in second grade. Their relationship became...