05/16/2010 05:12 am ET Updated May 25, 2011

Martha Stewart's Former Best Friend, Mariana Pasternak, Speaks Out About Trial In 'The Best Of Friends' (VIDEO)

Mariana Pasternak, Martha Stewart's former long-time best friend, is speaking out for the first time about Stewart's trial, which she found herself uncomfortably involved in. In her new book, "The Best Of Friends: Martha and Me," Pasternak details her friendship with Martha Stewart and discusses the end of that friendship when she testified against Stewart in court. She explained that she became a witness after a conversation about Martha's insider trading, in which either Pasternak or Stewart said, "Isn't it nice to have brokers who tell you those things?"

You can read an excerpt from "The Best of Friends" at the "Good Morning America" website.