In her new book, Celebrity Detox, Rosie O'Donnell takes a jab at her former View co-host, Barbara Walters.

"At some point, a person gets tired. It's inevitable," Rosie writes, according to The New York Post. "Barbara Walters is almost twice my age ... at some point it becomes necessary to step back. Everyone has to go. Going is part of the gig."

In response, Walters told Extra: "Rosie sent me the book with a note telling me how much she loved me. I have read the book — and I would like to concentrate on the love that she sent."

While O'Donnell's rep says, "Rosie loves and adores Barbara and always will," O'Donnell herself sums things up best in her book. She writes, "I would be less-than-honest if I were to say that there is no trouble between Barbara and I. I mean, our differences are obvious."