Palin says she didn`t know daughter was having sex

New York: Sarah Palin says she didn`t know her daughter Bristol was sexually active before she learned the teenager was pregnant.

The former vice presidential candidate told ABC`s Barbara Walters: "Truthfully, we were devastated." Bristol was a high school senior when she gave birth to son Tripp in December. Her pregnancy was publicly announced just after Sarah Palin accepted John McCain`s invitation to be his running mate. ABC released that exchange between Walters and Palin on Saturday. Portions of their interview begin airing Tuesday on `Good Morning America` and will be shown at length Friday on `20/20`. Palin is promoting her new book, `Going Rogue.` Bureau Report