Valerie Bertinelli is proud of Mackenzie Phillips' incest confession

valerie_bertinelli-2.jpg Valerie Bertinelli thinks that her "One Day at a Time" costar Mackenzie Phillips' confession of incest with her father, John Phillips,  will help her stay sober.

"I'm incredibly proud of her," Bertinelli added. "I think she's done a very brave thing, and I think through this, because she's touched so many people and helped so many people, it's going to help her stay sober."

Bertinelli also talks about writing another book about maintaining her 40 lb. weight loss. Her first book about losing weight, "Finding It," was a best-seller last year.